A gorilla escapes from a zoo and is reported to be up a tree in a park by a concerned passer-by. The zookeeper and his co-worker turn up in a van armed with a shotgun, and haul a huge alsation out of the back.
The keeper turns to his co-worker and says, "You hold the gun while I climb the tree and shake the gorilla down. When he falls to the ground, the dog will bite him by his bollocks and drag him into the van, just like his was trained to do."
"What's the shotgun for?" asks the co-worker.
"If I fall first," replied the zookeeper, "shoot the fucking dog."
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