Couldn't resist sharing this site from WikiHOW. I have found some really humorous "how to's." This would probably be saved for Sophmores who could handle this type of lab activity.
How to Calculate Pi by Throwing Frozen Hot Dogs
Definitely an interesting way to find Pi and took me a minute to figure out how it works (but there is a proof linked if it becomes too hard.
Anyone willing to try it? Any other "How Tos" that you found there?