Placing your coaster on top of your drink is universal language for "I'm coming back".
Adam Rifkin stashed this in #lifehacks
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Using a soda can tab to hold your straw? Genius.
Using a straw to remove a strawberry stem? Genius.
Using a fork to dunk Oreos? Ridiculous.
The other 30 lifehacks in this graphic? Ain't nobody got time for that...