Mike Tyson once offered a zookeeper $10,000 to fight a gorilla - because the silverback was bullying the other animals in his enclosure.
Boxing legend Tyson was the youngest heavyweight champion in history and went on to unify the division. He famously won his first 19 fights by knockout - 12 of them in the first round - but it wasn't always only humans he wanted to get in the ring with.
Tyson, now 53, has told of how he visited a zoo when it was closed and paid an employee to re-open for him and his then wife Robin Givens.
He then offered further cash to be let into the gorilla enclosure so he could "smash that silverback's snot box" after watching him give the other gorillas a hard time.
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