Time for another bump joke:

There was an old man who wanted to make his younger wife pregnant. So, he went to the doctor to have a get his sperm counted. The doctor told him to take a specimen cup home, fill it, and bring it back the next day. The old man came back the next day and the cup was empty and the lid was still on.
Doctor: What was the problem?
Elderly man: Well, I tried with my right hand...nothing. So, tried with my left hand...nothing. My wife tried with her right hand...nothing. Her left hand...nothing. Her mouth... still nothing. Then my wife's friend tried. Right hand, left hand, mouth....still nothing.
Doctor: Wait a minute. You mean your wife's friend tried too?!
Elderly man: Yeah, and we still couldn't get the lid off of the damn cup.