There's more to this drawing, which you can find on my Instagram account (@andy.statia). Our little quark particle is chatting with his friend and the exchange goes as follows: D: You up?

U: Yeah.

U: Wanna do something?

D: I'm down.

U: Awesome! Let's make pi!

I'm quite sure nobody is going to get this joke. Unless you're a particle physicist, which I know constitutes the vast majority of my audience, presumably. Right? More goofy dinosaurs coming up next!