event-watcher.js

window.boundEvents = { all: { count: 0, elements: [] } };
// Collect all the events
$('html').find('*').andSelf().each(function() {
  var events = $(this).data('events');
  if ($.isPlainObject(events) === true) {
    $.each(events, function(n, e) {
      if (window.boundEvents[n] === undefined) {
        window.boundEvents[n] = { count: 0, elements: [] };
      }
    });
  }
});
var bindTo = '';
$.each(window.boundEvents, function(n, c) { bindTo += n + ' '; });
// Bind to these events
$('html').bind(bindTo, function(e) {
  if ($.isPlainObject(window.boundEvents[e['type']])) {
    var el = e.target.nodeName;
    // Increment counts
    window.boundEvents[e.type].count++;
    window.boundEvents['all'].count++;
    // Track the element types
    window.boundEvents[e.type].elements.push(el);
    window.boundEvents['all'].elements.push(el);
  }
});

The previous version is nicer to look at in the console, but this one tracks what elements are targetted by the events.