Used to be a semi-professional poker player, which seems to have a high crossover with finance/trading types for obvious reasons. I enjoyed the debates, but sometimes it was a bit overwhelming how everyone had convinced themselves that they were magically providing a ton of value to the world and that's why they were filthy rich. Also the massive intelligence that seemed to only work when applied in one domain. Didn't mind taking their money, but never pretended I was providing society a useful function while doing so. :)