A man walks right into a bar and orders a beer.
He solely introduced sufficient cash for one beer although.
As he’s ingesting his beer, which was fairly costly, he realizes how dangerous he has to go to the lavatory.
Not wanting anybody to drink his costly beer, he takes out a card and writes on it, “I spit on this beer”, and walks to the lavatory.
When he comes again about 15 minutes later, there’s one other card subsequent to his beer saying, “I spit in it too.”