Back in school, I once had a history teacher who was allergic to wasp stings. The word was that if he was ever stung by a wasp that it could be life threatening. So when the weather was warmer and a wasp got into the classroom via an open window, we were in for a treat. Rather than squirming in the corner, our teacher would go freaking bat shit crazy and would not stop until that wasp was dead. He'd jump over students' desks swinging a ruler around wildly. It was great.
What made it better is that he was a very quiet, serious teacher too. Who always wore a full suit. Watching him go all rambo on a wasp was an incredible juxtaposition.