And the extremely rare circumsatnces, for the sake of debate...

Once, at 2nl, I folded the nuts on the river. And it wasn't a stupid thing to do. I was bb with a jack, and flopped a broadway gutshot. It was checked down to river, and I made the straight on the river. The sb was a nit, I hadn't seen him bluff once. He shoved 100bb+ with three people to act behind into a pot of limps. I realised that if I called, we were chopping, and the rake I would pay was worth more than the 1bb I had invested. I decided he makes this move without a jack some 0% of the time, so I folded.