Not one of mine, but enjoy.
Schrödinger was crossing the Mexican/US border illegally when he got caught by an imigration agent. The agent asked a few preliminary questions, and then, suspecting foul play, requested to inspect the trunk of the car. Schrödinger popped it open, and heard the agent say,
"Did you know there is a dead cat in here?", to which Schrödinger replied, "Well, I do now."
-Dan
Not science jokes, but since I was looking up jokes I can't resist posting these:
The masochist said to the sadist “hit me” and the sadist said “no”.
What’s the difference between an etymologist, and an entomologist? An etymologist knows the difference.