The 'Build-On Brick Shot Glass 4-Pack' is a fun shot glass set from ThinkGeek that combines a beloved kid's toy with an adult drinking ritual.
Although it's not an official LEGO set, the Build-On Brick Shot set is compatible with LEGO toys, as well as PixelBlocks, Mega Bloks, KRE-O, or K'NEX Bricks if you've got your own to add on. With tons of little raised pegs, you can put wheels or wings on the shot glasses and transform them into even more crazy vessels to get a drink into your mouth.
The pack of shot glasses comes in a set of four, including three primary colors plus white, for about $20. Hopefully the alcohol involved with these small parts won't make choking become a hazard for adults.