This bloke walks into a bar with an elephant.
"This elephant will do anything!" he announces proudly.
"All right," says the barman. "Make it stand on one leg."
and whispers something to the elephant.
Moments later the great grey beast lifts itself up onto its hind legs then carefully balances itself up on one leg.
The crowd in the bar go wild with enthusiastic cheering.
"Very clever," says the barman. "Now lets see it fuck my cat."
And so saying, he plonks the genial bar cat onto the bar.
The bloke with the elephant thinks a moment then takes the cat and places it on the floor in front of the elephant (who is still poised Bolshoi like on one leg).
He gets up on tip toe and whispers something in the elephant's ear.
As silence descends on the drinkers in the bar, the man steps back and the elephant teeters over and comes crashing down, splattering Tiddles across the floor.
"There you go," says the bloke. "That's fucked it."