Julius Caesar walks into a bar and says to the bartender
"I'd like a Martinus, please."
The bartender, taken aback says, "You mean martini, don't you?"
And Caesar says, "If I wanted more than one, I would have asked for it."
Wait, wait, here's another one. Slightly newer.
Say from the 1890s.
"Why do bachelors make such bad grammarians?"
"Because when they're asked to conjugate, they decline."