50 times! Thats like 5 times my joke repertoire. And most are going to start "two nuns in a bath" and not really make much sense.
For those old enough though I do have. Man walks in to a bar and asks for a pint of Whitbread. As the barmans pouring it the fella puts the money on the side and goes to the loo. Whilst there, and after the barmans finishde pulling his pint, a little woman of afro-carribean origin (PC and all that) jumps on the bar, pulls her skirt up and farts in his pint. When the fella returns the barman says to him "you'll never beleived whats just happened. That woman over there just farted in your pint". "Right, thats it" and the fella walks over to the woman. "Oi! You fart in mi whitbread". "No" she say. "I'm Tessa Sanderson"! And that my friends is as good as it gets. ( and you've got about 40 more to come)