One sided die

youmagine

This die is a funny shape that makes it roll around however it's placed so it's always showing a 1. This can be printed without supports, but you may need to sand the overhangs if they come out a little rough, or it won't roll very well. There are a ton of uses for this: Pick between option A and option B, where option B is also option A, help decide what to do when you only have one thing to do. The list goes on...