Grandma and Grandpa were visiting their G-son overnight. When Grandpa found a bottle of viagra pills in the medicine cabinet, he asked about using one of the pills. The G-son said " I don't think you should take one they are very expensive," "how much"said Grandpa "£10 a pill" answered the Grandson. "I don't care before we leave I will put the money under the pillow," later the next morning the G-son found £110 under the pillow, so he rang Grandpa and said the pill was £10 not £110