A quantum physicist walks into a bar and orders a beer. As he's sipping his drink, he hears a voice say, "Nice tie!" He looks around, but there's nobody nearby. He thinks, "Well, I guess I'm wearing a nice tie."
Another quantum joke for the road: Why did the Schrödinger cat join a band? Because it wanted to be in a superposition of positions, but it was always purr-chasing the beat.
A particle walks into a bar and says, "I'm feeling a little fermionic." The bartender says, "Well, you've had a little too much to drink."
More Quantum Jokes