jsbin.welcome.css

body {
  padding: 0;
  margin: 0;
  
  background: #3FA8C6;
  background-image: -moz-linear-gradient(top, #3fa8c6 0%, #3fa8c6 0%, #399ab2 100%);
  background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#3fa8c6), color-stop(0%,#3fa8c6), color-stop(100%,#399ab2));
  background-image: -webkit-linear-gradient(top, #3fa8c6 0%,#3fa8c6 0%,#399ab2 100%);
  background-image: -o-linear-gradient(top, #3fa8c6 0%,#3fa8c6 0%,#399ab2 100%);
  background-image: -ms-linear-gradient(top, #3fa8c6 0%,#3fa8c6 0%,#399ab2 100%);
  background-image: linear-gradient(to bottom, #3fa8c6 0%,#3fa8c6 0%,#399ab2 100%);
  color: #fff; 
  
  font-family: 'Doppio One', sans-serif; 
  text-shadow: 0 1px 0 rgba(0,0,0,.3); 
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.wrapper {
  width: 50%;
  margin: 0 auto;
}

h1, h2, h3, h4, h5, h6 {
  letter-spacing: -0.03em;
  font-size: 2em;
}

a { 
  border-bottom: 1px solid #fff; 
  border-bottom: 1px solid rgba(255,255,255,0.7); 
  padding-bottom: 0.15em;
  position: relative;
  
  color: white;
  text-decoration: none; 
}

a:after {
  content: '';
  position: absolute;
  height: 1px;
  left: 0;
  right: 0;
  bottom: -2px;
  background: rgba(0,0,0,.1);
}

a:hover {
  color: #C0E3EC;
}

h1 { 
  margin: 0.667em 0 0;
  padding-left: 0.5em;
  text-align: left; 
}

h2 {
  font-size: 1.5em;
}

small {
  margin-top: 1em;
  display: block;
  font-style: italic;
  font-size: 0.667em;
}

p em {
  font-style: none;
}

#welcome {
  position: relative;
  overflow: hidden;
  padding-bottom: 1em;
  padding-left: 20px;
}

#welcome > div {
  padding-top: 1px; 
}

#dave {
  float: left;
  margin-top: 3em
}

#welcome > h2 {
  margin-top: 0.5em;
  padding-left: 0.5em;
  margin-bottom: 0;
}

.bubble p {
  line-height: 22px; 
}

.bubble {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.1);

  padding: 0.667em 1em;
  position: relative;
}

.bubble:after {
  content: "";
  position: absolute;
  
  width: 0; 
  height: 0; 
  border-top: 20px solid transparent;
  border-bottom: 20px solid transparent; 
  border-right: 20px solid white; 
  border-right-color: inherit;
  top: 50px;
  left: -20px;
}

#features {
  margin: 0.444em 0 0;
  clear: both;
}

#features > h2 {
  margin: 0;
}

#features ol {
  position: relative;
  padding: 1em 0 1.5em;
  background: rgba(0,0,0,.1);
  border-color: rgba(0,0,0,.1);
  margin: 0;
  overflow: hidden;
  list-style: none;
  counter-reset: item;
}

#features li {
  width: 30%;
  padding: 0 1.5%;
  float: left;
  text-align: center;
  margin-bottom: 1em;
}

#features li h2 {
  display: block;
  padding: 1em;
  margin: 0.667em auto 1em;
  font-size: 1em;
  
  line-height: 1em;
  text-align: center;
  
  background: rgba(0,0,0,.1);
  border-radius: 2em;
  box-shadow: inset 0 0 1em rgba(0,0,0,.1), 0 2px 2px rgba(255,255,255,.1);
}

#next > div {
  width: 45%;
  float: left;
  padding: 0 2.5%;
}

img {
  z-index: 1;
  -webkit-transition: -webkit-transform 2s ease-in-out;
 -moz-transition: -moz-transform 2s ease-in-out;
 -o-transition: -o-transform 2s ease-in-out;
 -ms-transition: -ms-transform 2s ease-in-out;
 transition: transform 2s ease-in-out;
 position: relative;
}

img:active {
  -webkit-transform: rotate(1440deg) scale(1.2);
  -moz-transform: rotate(1440deg) scale(1.2);
  -o-transform: rotate(1440deg) scale(1.2);
  -ms-transform: rotate(1440deg) scale(1.2);
  transform: rotate(1440deg) scale(1.2);
}

@media screen and (max-width: 1200px) {
  .wrapper {
    width: 80%;
  }
}

@media screen and (max-width: 768px) {
  .wrapper {
    width: auto;
    margin: 0;
  }
  #welcome {
    margin-right: 2.5%;
  }
}

@media screen and (max-width: 500px) {
  .wrapper {
    text-align: center;
  }
  #dave {
    float: none;
  }
  
  #welcome {
	padding: 0 1.5em;
    margin: 0;
  }
  
  h1 {
    text-align: center;
    margin-bottom: 0;
    padding-left: 0;
    font-size: 1.8em;
  }
  #welcome > h2 {
    margin-bottom: 0.667em;
  }
  .bubble {
    text-align: center;
  }
  .bubble:after {
    display: none;
  }
  #features li {
    width: 47%;
  }
  #features li:last-child {
    float: none;
    clear: both;
    margin: 0 auto;
  }
  
  #next > div {
    float none;
    width: auto;
  }
}

jsbin.welcome.html

<!DOCTYPE html>
<html>
<head>
<script src="http://jashkenas.github.com/coffee-script/extras/coffee-script.js"></script>
<meta charset=utf-8 />
<title>Welcome to JS Bin</title>
<meta name="viewport" content="width=device-width">
<link href='http://fonts.googleapis.com/css?family=Doppio+One' rel='stylesheet' type='text/css'>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
</head>
  
<body>
  
  <div class="wrapper">
    
    <img id="dave" src="http://static.jsbin.com/images/logo.png" alt="Dave, the JS Bin bot">
    
    <div id="welcome">
      <h1>Welcome to JS Bin!</h1>
      <p class="bubble"><strong>Hello</strong>, I'm <em><strong>Dave</strong> the <strong>JS Bin</strong> bot</em>. <br/>JS Bin is a JavaScript, HTML and CSS playground. If you want to experiment, learn or help your friends with a problem, then JS Bin is for you.<br/>Have a play and build something <strong>cool</strong> &mdash; and don't forget to <a target="_blank" href="http://twitter.com/js_bin">follow me on Twitter</a>!<small id="message">Oh, and please don't click on, I get rather dizzy...</small></p>
      <h2>Here's just a few of the things I can do:</h2>
    </div>
    
    <div id="features">
      <ol>
        <li><h2>Saving</h2>As you type, HTML, CSS &amp; JavaScript is automagically rendered <em>live</em> in this window. I'll save the bin for you too <em>as you type</em>.</li>
        <li><h2>History</h2>If you're <a class="open" href="http://jsbin.com/welcome/edit?html,live#register">registered</a> and logged in, I'll remember all your bins and give you a nice complete list with quick previews.</li>
        <li><h2>Sharing</h2>You can share bins, but the output is automatically refreshed as you edit this page. You can also embed and <a class="open" href="http://jsbin.com/welcome/edit?html,live#share">do other cool stuff</a>.</li>
      </ol>
    </div>
    
    <div id="next">
      <div>
        <h2>Get meddling!</h2>
        <p>Open the <a class="open" href="http://jsbin.com/welcome/edit?css,live#css">CSS</a> panel and try changing things about! You'll see this window update <em>live</em> (and get your own unique copy of this <em>bin</em> right away).</p>
        <p>You won't see this message again by default, but if you do want a reminder, you can either use the <a class="open" href="#helpmenu">help</a> or visit <a href="http://jsbin.com/welcome/edit?html,live">jsbin.com/welcome</a>.</p>
      </div>
      <div>
        <h2>How you can contribute</h2>
        <p>JS Bin is an open source project available on <a href="http://github.com/remy/jsbin">github</a> with instructions on how to host it yourself.</p>
        <p>If you're in the running workshops (or teaching to a much wider audience), you can get a custom skin and starting templates &ndash; like <a target="_blank" href="http://sebly.jsbin.com">this</a> one. Just <a target="_blank" href="http://leftlogic.com/contact">get in touch</a> and ask for Rem.</p>
      </div>
    </div>
    
  </div>
  
</body>
</html>

jsbin.welcome.js

if (location.pathname === '/welcome' || location.pathname === '/welcome/') {
  location = '/welcome/edit?html,live';
}

if (window.location.pathname.indexOf('/edit') !== -1) $('a.open').click(function (event) {
  event.preventDefault();
  window.top.$('a[href$="' + this.hash + '"]').mousedown().click();
});

var presses = 0;

var spin = [
  "Woahohaohaohaahoahaohaohaohaohaoha...",
  "Nononono...aiiiiiiiiiiiiieeeeeeee....",
  "Aaaaaaaaaghhhhh...woahwoahwoahwoahwoah...",
  "You're eeeeeeeeviiiiiiilllllllll....",
  "Eee...eee...eee...eee...eee...",
  "Woowoowoowoowoowoowoowoowoo..."
];
  
var stop = [
  "Please... never again.",
  "I'm so dizzy.",
  "That's just... cruel.",
  "Don't you have better things to do?",
  "I can't feel my toes... oh wait, I don't have any toes!",
  "This isn't fun anymore.",
  "...",
  "I'm going to be sick.",
  "Uh-oh, I think I just dropped some tables...",
  "Yep, I think I'm about to SQL-project everywhere...",
  "SELECT * FROM `stomach`...",
  "var_dump($result)...",
  "+_+"
];

$('#dave').mousedown(function () {
  
  $('#message').fadeOut(function () {
    $(this).text(spin[presses % spin.length]);
    presses = presses + 1;
  }).fadeIn();
  
}).mouseup(function () {
  
  $('#message').fadeOut(function () {
    $(this).text(stop[presses % stop.length]);
  }).fadeIn();
  
  if( presses >= stop.length - 1 ) {
	$(this).animate({left: '-999px'}, 1000 * 10, function () {
      $(this).animate({left: '0'}, 1000 * 4);
      presses = 0;
    });
  }
  
});