(this one may make you say 'Ewwwww')
scroll down for the rest.
..... for an annual exam. The doctor checks the guy over and at the end says that he is in very good shape for somone his age. Then the doctor says "So, all I need now is a urine sample, a stool sample and a semen sample for the lab and we're all done." The old guys says "Gee Doc, I am in kind of a hurry, can I just leave my shorts?"