When using custom events on a JavaScript object (such as window, document or a custom object), if using an event name that equals to a property name on that object, the trigger method will try to run it as a function, throwing an error if it's not a function type.

i.e.

$(document).trigger('width');

Will throw: TypeError: Property 'width' of object #<HTMLDocument> is not a function (on WebKit)

The same will happen if I'm using a namespace in my custom events:

$(document).trigger('width.change');

If the property is a function the trigger method will call it.

$(document).trigger('open');

Will cause the page on Chrome to go blank, for example, same as executing:

document.open();

In my experience it came as a problem when using custom events attached to custom object, as such:

var obj = {a: 1, b: 2, c: 3};
$(obj).on('a.change', function(e) {...});
$(obj).trigger('a.change');

This will cause an error since the trigger method is going to try and run 'a' as a function.

Tested on all major browsers (Chrome, FF, IE8+, Safari).