Two Irishman saved all their money and went to Germany for a vacation.
While there, they get the bright idea to get laid so they visit a brothel.
After they knock on the door, the madame of the house opens the peep window and asks the men what they want.
They tell her that they want to get laid but they only have fifty bucks. Insulted, she tells them to go fuck themselves.
About an hour later, there's a knock on the brothel door again. The madame once again opens the peep window and sees the two Irishmen in front of her.
Sheepishly, the first Irishman says, 'well, we fucked eachother, now who do we pay?'