During the process of grading a final exam, one student's answer to a particular question was very different from my own "correct" answer, but persuasive enough to make me question my own assumptions.
After looking a few things up, I think the student is right. I now have to change my own answer.
Naturally, this was the last exam I graded, so now I get to go back through every single other one and redo the grading on this question. (I won't take points away from students who made the same mistake I did.)
I have to wonder how common this is. I know that every teacher says they learn as much as their students, but I didn't expect to be learning things after the class was already over.
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I've experienced this a couple of times when grading. Now I read through a random sample of ~10 answers before I write the key for that question :)
I've inflicted it at least once: on the professor of my undergrad AI class, during the final, while he peeked over my shoulder and watched me get stuck on a resolution refutation proof. (He promptly announced a correction to the whole class. That was his TAs' fault, tho.)
I've had dreams where I argued with "somebody", lost, and remembered everything. Exemplar:
Me: You can't rest a golf bag on an off-center pivot point, it'll tip over vertical!
He: Exactly!!
Me: (oh, duh, it should be vertical)
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