Let’s set the stage: I was in a graduate computer science class, with an ultra-smart Theory professor at UC Berkeley.
The professor was talking about very large numbers, and he said, “billions, trillions, Brazilians.” He has an accent, so it took a bit for the class to realize what he’d said, but once they did, everyone started laughing.
I’m not sure whether it was intentional or not; I would believe it either way. It’s really easy to say stupid things when you’re teaching, but this is a professor with a sense of humor. This doesn’t quite qualify for a “mock the stupid” post, but it was a really funny incident.