The following was contributed by Emil:

A man walks into a pub, sits down at the bar, and says to the barman,
"cor! I've just had my first blow-job and it was great! -- I'll have a
large whiskey please, barman." The man takes his whiskey and downs it. 
"Same again?" asks the barman. "Okay" says the man and downs the second. 
He then orders a third and a forth and downs them both.In fact in total
he downs 27 whiskeys. "Do you want another?" asks the barman. "No I don't 
think so", says the man, "If 27 whiskeys won't take away the taste
I don't think that another one will!"