A law professor has been spotted listening at a college window with a stethoscope.

Professor Hiro Aragaki, who teaches negotiation at Loyola Law School in Los Angeles, was snapped by a student whose friend posted the photograph on Reddit:

"Please cough when I cup your doorknob"

No-one is quite sure what Aragaki is doing. He may be eavesdropping on a study group without their knowledge, which would be a bit creepy. Or he may have a medical fetish for buildings, which would be brilliant. US site Above the Law asked him to clear up the confusion, but he didn't reply, because he's busy administering a bedbath to that chimney which keeps giving him the eye.