Insert geekish laughing here.

Two atoms are sitting in a bar, drinking. So, finally, they decide to leave. They're thoroughly sloshed and can barely walk straight. So, they're walking down the street, and one says to the other, "I think I left my electron in the bar."

"Are you sure?" The other asks.

"Yes," the first replies, "I'm positive."


(Well, I think it's hysterical.)