The Funniest Joke I Have Ever Heard

While I'm not good at telling jokes, I'm good at laughing at jokes. As for the funniest one I've ever heard, I'm ruling out:

• Dumb blonde jokes––they're sexist.
• Animal jokes––I've never hears a truly funny one.
• All puns.
• Classic and practical jokes––they're too popular.

This leave science jokes. The only reason I know some science jokes is because the school I go to is full of nerds who talk about science all the time. I think the funniest science joke I have ever heard was told to me by my brother, though. It goes:

Neutrino.
Knock Knock.
Who's there?.

If you don't know what a neutrino is, look it up. It takes a little bit of explaining that I don't have the energy for right now.

Here's a silly joke I used to laugh at:

What note does a piano play if it falls down a mineshaft?
A-flat Minor.