There is a family gathering, with all the generations around the table. The teenagers smuggle in a Viagra tablet and put it in Grandpa's drink.
After a while, Grandpa excused himself because he has to go to the bathroom. When he returned, however, his trousers were wet all over.
"What happened, Grandpa," asked his concerned children?
"Well," he answered, "I had to go to the bathroom. So I took it out, but then I saw that it wasn't mine, so I put it back.
