Grandpa found a bottle of Viagra in the medicine cabinet, he asked his son about using one of the pills.
The son said, "I don't think you should take one Dad, they're very strong, and very expensive".
"How much? asked Grandpa. "Around $10 a pill" answered the son.
"I don't care." said Grandpa, "I'd still like to try it, we'll be leaving in the morning, so I'll put the money under the pillow".
Later the next day, the son found $110. under the pillow. He immediately called Grandpa on his cell phone and said, "I told you each pill was $10, not $100.!
"I know", said Grandpa. "The hundred is from Grandma."
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