Grandpa

There is a merry family gathering with all generations around the table. The little children (naughty little rascals) smuggle a Viagra tablet into Grandpa's drink. After a while, Grandpa excuses himself because he has to go to the bathroom. When he returns, however, his trousers are wet all over. "What happened, Grandpa?" he is asked by his concerned children. "Well," he answers, "I had to go to the bathroom to pee. So I took it out, but then I saw that it wasn't mine, so I put it back.