Semen Washer

....was listed as one of the ten worst jobs in science.

Here's the money shot:

"The hardest part is explaining it to friends," Schillinger says. "But we do have stories." Like what? "Like the donor who was in the room for the longest time. We had a big discussion about who was going to check on him. Turns out he thought he had to fill up the entire specimen cup."

Which I think was the punch line to a joke...