My Cal brethren pulled a good one on a USC basketball player. Nothing like using IM to invent a fictitious babe, name Victoria, chatting up the opposition, Gabe Pruitt, and rattling Pruit mid game to good effect.
Of course others might suggest the prank a little on, if not past, the edge but I put it in the Robin Ficker category of deviantly inspired mischief. Ah the mircles of the modern Internet.