Older parents are staying at their son's house and stumble on viagra in the medicine cabinet. The Dad asks the son about it. Son says I don't know Dad, it's pretty powerful and costs about $10 a pill it might be too much for you. Dad says, maybe I'll try one and pay you the $10. The next morning as they are heading home the Dad hands his son $110. The son says Dad, it's only $10 a pill. Dad says I know, the hundred is from your Mom.