A very old man goes to his doctor for an annual exam.

He's
accompanied by his wife.

When they get there, the doctor says
"I need 3 things from you. A urine sample a stool sample
and a sperm sample".

The old man, being very hard of hearing, yells at his wife
"What did he say? What does he want"?

His wife yelled back "He said he needs your underwear!"