A guy goes for a job at a zoo and is told that because they're a bit short of money the job is for him to dress up in a gorilla suit and pretend to be a real gorilla.
Short of cash himself, he takes the job. He feels guilty and a bit unsure of himself but after the first week, he starts to settle in and realises that from a distance no-one can tell he's not a real gorilla.
One day he's running around for the visitors and jumps into a tree and has a swing on the tyre but today he's a bit over-enthusiastic and swings high enough for him to fall off the tyre, over the fence and into the neighbouring lion enclosure.
Realising what's happened, he stays still where he's landed hoping he won't be seen but a couple of the lions get up and come towards him. He starts to panic and shouts 'HELP ... HELP!!!'
Suddenly one of the lions leaps on top of him and says 'Keep it quiet will ya ... or we'll ALL lose our jobs!!!!'