I faced a problem with 'tap' event. Steps to reproduce:

1. Attach an 'tap' event handler to some element
2. Remove attached handler by event name ('tap') or by namespace
3. Attach new 'tap' event handler to the element
4. Click on element

Expected: second handler is invoked

Actual: both old and new handlers are invoked

Example:  http://jsfiddle.net/W7P5r/

Here you can see, that after clicking on "click" button one cell is added to the grid, but after clicking on "tap" or "tap.namespace" button two cells are added, because previously attached handler revives.

Browser: Chrome 24