Chap in my old local we used to play pool with, good guy, had kids, hard worker. Used to strip and renovate pubs etc that had gone into receivership, during a lock in one night he was telling everyone about the pub he was working in. They had taken 6 plasma tellys out, (bear in mind this was 2001 and they cost a few grand then). So 4 of the lads bought them all off him. 300 quid each.
About a week later it dawned on everyone that he'd only been coming in the pub for about a month or so, and had just played a blinder. Charmed his way in, made everyone think they had known him for ages. And screwed them out of a lot of money. Never seen again. Turned out he had also done it on 3 other pubs in the town.