For my calculus students:

An infinite number of mathematicians walk into a bar. The first one orders a beer. The second one orders half a beer. The third one orders a quarter beer. The bartender puts two beers on the bar and says, “You people really need to learn your limits.”

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*Related*

Three mathematicians walk into a bar. The bartender says, “Hey, do all of you want a beer?” The first mathematician looks baffled and says, “I don’t know.” The second mathematician looks baffled and says, “I don’t know.” And the third mathematician says, “Yes.”

Ha! I laughed, but I haven’t had much luck convincing anyone else that yours is actually a joke, rather than a pop quiz on quantifier usage :)

Update: your joke actually happened. I was out with three mathematicians at an Ethiopian restaurant; the first said, “so do we all want to order several dishes to share?” and the other two said “maybe” and “perhaps” more or less simultaneously, and then I said “yes”.