See this classic game in action as The Helpful Dad reviews it.

From the retailer:
The Barrel of Monkeys is a barrel of fun! Dump your monkeys out on a table and pick up one monkey by his arm. Hook other arms through a second monkey’s arm and continue to make a chain. Your turn is over when a monkey is dropped, and the first player to hook together 12 monkeys wins! Barrel colors are assorted.