When I was young I heard someone claiming that Baboons could count to 3. The proof was that corn farmers learned to scare off raiding Baboons by hiding in the field (with a rifle). However, if a farmer was seen to go into the field, the Baboons waited until he or she came out before raiding. The solution was to send four farmers in, and three out. This apparently fooled the Baboons. At least until a Baboon named Isaac Babewton came along....