I have a problem when I click inside of certain windows and the entire window moves so that the title bar is centered on that point.
Another stupid IE trick(OSX): apl(meta?)-click and move the text, but jiggle it up and down a bunch. It will give you a wait cursor because it appears to be too much for the app.
My other favourite is to hit meta-O to open a file, then hit escape right after. Locks up the browser sometimes for 30+ seconds.
or you could just load up a page on slashdot with say 500 comments, and watch it lock up every browser window for 60+ seconds.
MSIE sucks.