No, it is supposedly the technique that was used by farmers in the Transvaal to discourage baboon packs from raiding their corn fields. The baboons apparently could not distinguish between groups of 3 and 4 people, so they did not realize that someone was waiting to ambush them in the field. Sorry for the bad joke. I should have left that out.

The implication is that since they can only count to 3 they think it's safe to enter after 3 of the 4 leave. This allows the remaining one to shoot at the baboons.