An old man comes down stairs in the morning, eats breakfast with his wife and gets up to leave.  His wife asks, “Where are you going?”

“I’m going to the doctor’s to get some viagra. It’s finally time.”

His wife stands up, puts on her coat, and prepares to leave also.

“Where are you going?”, he asks.

“I figured if you are going to get that rusty old thing working, I might as well go get my tetanus shot!”, his wife responds.