First class of the 2nd term, and there are two female students in the class nobody had seen before. A bit younger than us, but we didn't say anything.
The prof was going through the derivation of the generating equation for the associated Laguerre polynomials (or somesuch), and the new girls' eyes were getting wider and Wider and WIDER.
Finally, one of them raised her hand and timorously asked, "This isn't freshman Chemistry 101, is it?"
"No."
We decorously waited until they had left the lecture room to share a good laugh.
Cheers!
That, sir, is a funny story!