An elderly gentleman went to see his doctor and asked for a prescription of Viagra. The doctor said, "That's no problem. How many do you want?"
The man answered, "Just a few, maybe 4, but cut each one in 4 pieces."
The doctor said, "That won't do you any good."
The elderly gentleman said, "That's all right. I don't need them for sex anymore as I am over 90 years old. I just want it to stick out far enough so I don't pee on my shoes."
There is also the man who went to the chemist and said "Do you sell viagra?"
Yes we do said the chemist.
Can I get it over the counter?
"For that you'd need to take two or three." said the chemist.