[noisycarlos]

I actually learned to count on binary with my fingers at some point. So i can technically count to 32 on one hand and 1024 using both.

It's been useful a handful of times (less than 5 times, not 32).

But it's fun, and not that hard once you learn the pattern.

[z500]

Teaching people how to do 4 in finger binary is always a hit, too.