[bhattid]

I like this one!

I was curious what the margin of error for this was (I'm conjecturing the sum of widths of the fingers touching the stick), so I tried this out, but with a pencil instead of a stick.

I was consistently getting just off-center, so I was thinking maybe the 'surprise' wasn't consistent, until I realized the end of the pencil (metal + eraser) is probably denser than the wood and shifts the center of mass to exactly where my fingers ended up. :)

[bhattid]

Playing around a bit, I think the margin of error is probably the average of the sum of widths (so the width of a finger, if they're equal).