A man goes to the doctor because he can't get it up. Naturally the doc perscribes Viagra. He tells the man, "take one of these before you have sex and enjoy."

So the man goes home, pops a pill, and tells his wife to prepare for some wild nasty sex. His dick isn't getting hard, so he pops another pill to jump start it. Still nothing happens, so he takes another pill. By this time, his wife is getting frustrated and mumbling about how she needs to start dinner soon, so the man swallows the whole bottle and fulfills his promise to his wife.

The next day, the man's 9 year old son walks into the Doc's office and asks him, "Are you the man that gave my daddy those pills?"

"Of course, is there something wrong?"

"Well, I thought you should know that they work. My mommy is dead, my sister is pregnant, my asshole hurts, and when I last saw my father, he was laying on the couch saying, 'here kitty, kitty, kitty' "