jQuery: Trap all click events before they happen?

Yes, use .addEventListener() and set the 3rd option to true. This will bind the listener to the capture phase and execute the function before anything else gets executed.

Here's an example where this will stop all click handlers from executing:

document.addEventListener('click', function(e) {
    e.stopPropagation();
}, true);

See it in action here:

http://jsfiddle.net/wLwMh/1/