I think this might have been the same zoo
A bloke was starting his first day as a zookeeper and was shocked to learn he’d have to go into the lion’s enclosure.
He asked an older keeper what to do if the lions approached him.
“Oh that’s easy,” the older keeper said. “Just hold your hand up and say ‘Stop’ in a firm voice.”
“What if they don’t stop?”
“In that case, take a step backwards and hold your hand up and say ‘Stop’ in a firm voice.”
“But what if they keep on coming?”
“Take another step back and tell them to stop again>”
“But what do I do if there’s no room to move backwards?”
“In that case, you throw s*** at them.”
“What if there isn’t any?” asked the nervous newcomer.
“Don’t worry, there’ll be plenty.”