Old Fred was put into a nursing home against his will. Every day for a week, he called his son asking to come get him.
"Dad, you know we have no room here and both the wife and I have to work long hours. You're in the best place possible," the son replies, wearily.
Next day, Fred wakes up with the first boner he's had in years. A young nursing aide comes in, sees it and says, "Well, let's just take care of that, shall we?"
Fred is ecstatic and calls his son, telling him he wants to stay. The son asks why and Fred tells him what happened that morning. The son doesn't believe him, but says, "If that's what you want, dad, fine."
Next morning, Fred wakes up and falls getting out of bed. He's on his hands and knees with his nightgown up over his back, barearsed. A young orderly comes in, sees him and promptly rogers the old guy.
Right away, Fred's on the phone to his son, demanding he come get him.
"What's happened now?" the son asks.
Fred tells him, to which the son replies, "Gee, dad, don't they kind of cancel each other out?"
"Do they hell," the old man shouted. "I get a hard-on once a year but I fall down twice a day."