How many beers?

An infinite number of mathematicians walk into a bar. The first one orders a beer. The second one, half a beer. The third, a quarter of a beer. The bar man says "you're all idiots" and pours two beers.

This meme features a classic mathematical nerd joke displayed as text on the left side, paired with a photograph of a full pint glass of light beer on the right. The joke describes an infinite sequence of mathematicians ordering beer in exponentially decreasing portions: the first orders 1 beer, the second orders half a beer, the third orders a quarter of a beer, and so on. The bartender recognizes the sum of this infinite geometric series equals 2, so he simply pours 2 beers and insults the mathematicians for overcomplicating their order.

This is a widely circulated classic math pun meme, shared as RSS content from 9Gag. The core joke referencing the sum of the convergent infinite series 1 + 1/2 + 1/4 + ... = 2 has existed online for many years. This specific iteration combines the joke text with a stock image of a beer for a simple meme format, which is popular on humor platforms like 9Gag among audiences interested in math or geek humor.