I suggest not to try the last two ones (especially the last one if your teacher is a woman).
The curse words previously posted are really offensive and might cause you big trouble. I doubt your teached will fall for it if you pretend not to know the real meaning.
try this:
face de cul de poisson pane a roulette!
(if you do speak a little french you'll figure out how to pronounce it! As for the meaning...
<small>[ September 11, 2003, 03:41 PM: Message edited by: Howdoin ]</small>