Zookeeper

Two guys own a zoo. To their angst their lone female gorilla
goes into heat. Knowing she will be violent if not looked after
they take her to a vet for advice. He says she needs to be bred
by a male gorilla. Knowing they can't find a male they weigh
their options. One says to the other, hey that guy that cleans
the cages is kind of crazy, maybe he'll do it. They ask him if
he'd do it for $500. He asks for some time to think about it.

The next day he comes back to the guys and says he'll do it on
three conditions.

1) No commitments, once it's done it's over.
2) If there is any kids I'm not responsible.

The two say O.K. no problem, what's your third condition?

Well he says it's going to take me a few weeks to come up with
the 500 dollars......