One of the guys I was working with claimed he could actually 'hear' radar; well the prf from the transmitter, anyway. We did a few experiments and yes, when close enough, he could detect whether the radar was on or not. He had a theory that there was some sort of rectification going on in his middle ear that was stimulating the nerve endings, giving him the impression of hearing a quiet "chirp". Whatever the true explanation, he did seem fairly unique among us.
I once knew about a guy that had a pet turtle, he claimed that on occasion that turtle told him to call in sick and that something always happened on those flights.
