Doctor, Old Man, and Jar...

The Doctor gave a jar to an old man, who is his patient, to take home for his sperm count. The next day, the old man returned the jar empty.

Doctor: Why empty?
Old Man: I used one hand, then both hands, but it didn't work. I asked my maid then. She used her hands, mouth, even things, but nothing! I even asked my driver!
Doctor: Your driver?!
Old Man: Yes! Even he couldn't open that stupid jar of yours!

Akala ko kung ano na, hehehe :P