Little Johnny jumps on a bus and sits behind the driver:
Johnny starts chanting at the top of his voice.
”If my Mum was a cow and my Dad was a bull, then I’d be a calf. If my Mum was a ewe and my Dad was a ram, then I’d be a lamb. If my Mum was a mare and my Dad was a stallion then I’d be a foal.”
The driver was getting p*ssed off and said to Johnny.
”And if your Mum was a whore and your Dad was a wanker then what would you be?”
“A bus driver!”