I can count how many times on my fingers I've done it: 11,(reply>), @Fuuryuu Indeed, you can do that. Use your thumb for 1, index finger for 2, middle finger for 4, ring finger for 8 and pinky for 16. You can add fingers to get every number up to 31. Showing someone a four can be a little rude, though.,(reply>), @mkl indeed, particularly since I independently came up with that at like eight years old or something,(reply>), @Fuuryuu NEEEEEEERD,(reply>), While I realize it's a mutation joke, just using one hand as a 5-digit binary register allows you to count to 31 at one hand, and 1023 on both together,(reply>), @CraftyF0X It can't explain my 7 extra toes though