Perhaps it was because:
i. I've never heard it before, and
ii. I didn't second guess it either.
Enjoy - I did:
A blonde was getting her haircut while wearing a pair of headphones.
The hairdresser asked her to take them off, but she protested that she would die without them.
The hairdresser sighed, and started cutting the hair around the headphones.
Soon, the blonde fell asleep, and the hairdresser removed the headphones.
A few minutes later, the blonde collapsed, dead on the floor.
Alarmed, the hairdresser put the headphones to her ear and heard,
"Breathe in. Breathe out."