Can’t Take Fresh Jokes

(One of the physics professors is quite young-looking. We’re grading finals and he’s telling stories.)

Professor: “…so when security showed up, they demanded my student ID. And when I gave them my ID, which says ‘faculty’ on it, they wanted to confiscate it for being fake! Luckily [Other Professor] was there to vouch for me.”

Other TA: “Hey, prof, what’s your secret for staying so young looking?”

Professor: “Good genes. You know, people used to ask me that, and I used to say that it was all my time working with gamma radiation, but I don’t say that any more.”

Me: “Why not?”

Professor: “Freshmen can’t take a joke.”