Barrel of Monkeys is the genuine retro article. As developed in 1965, and made by Milton Bradley. There are twelve monkeys in each multi-purpose plastic barrel. It doubles as monkey lair for pulling monkeys out of one by one in a chain. It's also a handy carry case.
Like most simple games there's a higher meaning - Barrel of Monkeys can help in understanding areas of science from protein structures to polyhedral helixes.
This is the perfect present for a miserable git colleague because it's inexpensive and every monkey in the barrel has a gleeful grin which some people find intensely annoying.
Crucial fact : the monkeys herein are probably chimpanzees since they don't have a tail.