When you're trying to take a test

True story, I was in my third year of college taking a math test, and out of nowhere I thought of a joke from when I was 7. I didn't understand it before, but I did at that moment.

What was the joke?

A select amount of memes make me laugh. This is one of them.

yay

Btw this isn't a joke, but once during a test, I thought of a man using poison ivy as toilet paper, then realizes his mistake as he screams in anguish as he slow disintegrates. My mind is so weird..

OMG, that's actually very funny, my random thoughts aren't that weird.