Continuing:
A proton walks into a bar and orders a drink.
Bartender asks, "So, you're a proton, eh?"
Proton answers: "Yep."
Bartender: "Are you sure?"
Proton: "Yeah, I'm positive."
A neutrino walks into a bar.
Bartender asks him, "What'll you have to drink?"
Neutrino says, "Oh, nothing, I'm just passing through."