A young man was delighted to finally be asked home to meet his Girlfriend's parents.
He was quite nervous about the meeting though, and by the time he arrived punctually at the doorstep, he was in a state of gastric distress.

The problem developed into an acute state of flatulence and halfway through canapes, the young man realised that he couldn't hold it in any longer without exploding.
A tiny fart escaped.
"Spot", called out the young woman's mother to the family dog, lying at the young man's feet.
Relieved at the dog getting the blame, the young man let another slightly larger one go.
"Spot!" she cried out sharply.
"I've got it made", thought the fellow to himself. "One more and I'll be fine". So he let loose a really big one.
"Spot!" she shreiked. "Get over here before he shits on you!"