A long time ago, I had a reddit account with about 20K karma. At some point I was short on cash, so I googled where to sell it and found some forum, I got an offer pretty quick for 300 bucks and went with it. The guy paid immediately but the scumbags on the forum held the funds for like 2 weeks until I left a bad review for their site, then got all aggressive about removing it and eventually deposited 250.

A year or so after I checked the account for shits and giggles and the guy had used it to scam people buying watches on some subreddit for that, after which they either got banned or closed their account.

Thanks for attending my TED talk.