Simple "pump" animation using a Greensock timeline ... Pump it!

pumpit.js

// Pump it!
(function() {
	var $el	= $('#logo'), // <-- Change to whatever
	canPump	= true,
	pumpTL	= new TimelineLite({
		paused: true,
		onStart: function() { canPump = false; },
		onComplete: function() { canPump = true; }
	});
		
	pumpTL.to($el, 0.08, {css:{scale: 1.03}});
	pumpTL.to($el, 0.18, {css:{scale: 1}});
	pumpTL.to($el, 0.1, {css:{scale: 1.05}});
	pumpTL.to($el, 0.4, {css:{scale: 1}});
		
	$el.on('mouseenter', function() {
		if (!canPump) return;
		pumpTL.restart();
	});
})();