it's my life

Little Johnny is excited because the circus has come to town and his mum has got front row tickets for him. Finally the evening comes and Little Johnny and his mum go off to the big top. Little Johnny sits there and enjoys the lions and the tigers and the jugglers and the trapeze artists, and finally out comes little Johnny's favourites, the clowns.
Johnny is loving the clowns and their humourous japes until one of the clowns comes up to him and says, "Little boy are you the front end of an ass?"
"No" replies little Johnny "Are you the rear end of an ass?" "No"' replies little Johnny again. "In that case," says the clown, "You must be no end of an ass."
Little Johnny is distraught and he runs out of the circus and all the way home in tears. When his mum catches up with him she says, "Little Johnny, don't worry. Your Uncle Marvo, the master of lightning wit, backchat and repartee is coming to stay tomorrow. We will take him to the circus and he will sort that nasty clown out."
At this news little Johnny cheers up and looks forward to the next night. The next night comes and, sure enough, Uncle Marvo, the master of lightning wit, backchat and repartee arrives and the three of them set off for the circus. When they get there Little Johnny, his mum and Uncle Marvo, the master of lightning wit, backchat and repartee, sit down and enjoy the lions, the tigers, the jugglers and the trapeze artists, and then out come the clowns.
Again Little Johnny is enjoying their antics and yet again one of the clowns comes up to him and says, "Little boy are you the front end of an ass?"
Quick as a flash, Uncle Marvo, the master of lightning wit, backchat and repartee jumps up and shouts at the very top of his voice, "Fuck off you Red nosed Cunt!"