The bartender interrupts them, says "I know your limit," and pours them two beers.
The mathematicians are ordering a geometric series: 1 + 1/2 + 1/4 + 1/8 + ... which converges to exactly 2. The bartender — apparently well-versed in calculus — knows that the sum of this infinite series has a limit of 2 and pours accordingly. "I know your limit" works as both a calculus term and a bartender cutting someone off.
Drag out the setup — let the pattern of orders sink in — then have the bartender cut them off with confident authority. The joke rewards anyone who does the math in their head.
Perfect for:
Math jokes rely on the same logical structure as mathematical proofs — setup (hypothesis), expectation (theorem), punchline (QED of comedy).
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