We use jQuery to bind/trigger events on plain JS objects like so. One of our objects has a method on it called "focus", and we also define a method on it called "focus", like so:

var obj = { focus: function() {} };
jQuery(obj).bind('focus', fn);

// later on
jQuery(obj).trigger('focus');

In jQuery 1.8.3, both the focus member and the focus event would get invoked. In jQuery 1.9.1, only the focus member gets invoked. This is definitely an edge case, but it represents a diffence of behaviour between jQuery 1.8.3 and jQuery 1.9.1. The reason comes down to a special event defined for IE's sake that tries to call the focus method of the DOM element. Ideally (for me anyways), the special event would make sure the object is a DOM node before invoking thereby creating a distinction between events and methods, but I understand that it may not be practical to actually implement that way for such an edge use case. Just want to log this change in behaviour somewhere in case this trips up any other people.

JSFiddle: http://jsfiddle.net/hqJ5A/