Grandma and Grandpa were visiting the kids overnight, when Grandpa found a bottle of Viagra in his son's Medicine Cabinet...

He asked the son about using one of the pills, and the son said, "I don't think you should take one; they'revery strong and very expensive." "How much?", asked Grandpa. "$10.00 a pill", answered the son. "I don't care", said Grandpa, "I'd like to try one, and I'll leave the money under your pillow as soon as I break this $50.00 bill." The next morning the son found$110.00 under his pillow. He said to Grandpa, "I told you each pill was $10.00, not $110.00." "I know," said Grandpa, "The extra$100.00 is from Grandma."