An emaciated man was found dead in his bathtub. The apparent cause of death was starvation.
Oddly, he still had enough food in his fridge, and no apparent mobility problems that would prevent him from getting to it.
His relatives did not know of any mental problems either.
The best investigator in the city was called to the scene. She takes one look at the bathroom and asks the relatives,
“Was he a programmer?”
She wordlessly shows them a large shampoo bottle with an instruction: “1. Apply the shampoo. 2. Rinse. 3. Repeat the procedure.”