Petri Dish

Being the tremendous germophobe that I am, I find these really creepy and I cannot see a practical use for them outside of prop for a weirdo biology teacher or uber nerdy child. I had a math teacher in high school who celebrated Pi Day with her husband (a mathematician), I could easily see her science teacher doppelganger exchanging these for monumental occasions likes the start of cold and flu season.

However, I am tempted to get Theodore the Giardia one so that he can toss it around and kick its ass.