Everyone likes a good Limerick. Here are two of my favourites:

Said the Duchess of Lee once at tea,
Young man do you fart when you pee?
I replied with some wit,
Do you belch when you s**t?
I think that was one-up to me.

And the other:

There once was a fellow called Reg,
Who was kissing a girl by a hedge,
Along came his wife,
With a big carving knife,
And cut off his meat and two veg.