One other little thing, this is from the I Love Teaching files:

Yesterday, in one of my labs, we did a titration, OK? (Titrations, for those who've never done them, are a chemical way of determining the concentration of a substance you don't know the concentration of. They can be kind of a pain to do because it's easy to overshoot, and if you do, you have to start over).

Well, one of the teams in my class hit the equilibration point PERFECTLY on the first try. And the guy exclaimed, "Winner, winner, chicken dinner!"

I had never heard that before but it made me laugh, especially in the context of a chemistry lab type thing.