How many numbers of Pi can you rattle off? Probably not many. Probably even fewer if you're drunk. But you can at least cheat with these glasses from TheUncommonGreen that are printed with hundreds and hundreds of digits from the mathematical constant.
The collection is perfectly compatible with whatever you're imbibing. A shot glass is $US20, and a tumbler and a pint glass are both $US36 each. So regardless of your beverage, you can impress people with your sharp knowledge of geometry. Provided you can still see the numbers clearly. [TheUncommonGreen via Technabob]