Sheldon: Who's ready to laugh?
Sheldon: Okay. So Feynman, Einstein and Schrodinger walk into a bar. Feynman says, "It appears we're inside a joke." Einstein replies, "But only to an observer who saw us walk in simultaneously." To which Schrodinger says, "If someone's looking in the window, I'm leaving."
Leonard: (chuckles) That's actually funny.
Raj: You should send that to Jimmy Fallon.