Somebody created a site called PonziCoin (yes, really) and encouraged people to "invest" their Bitcoins by promising lucrative returns. No doubt you're thinking, "Nobody is actually stupid enough to send him their magic beans, right?" Well, it turns out some people really are that dumb. And when the entirely predictable happened, they actually whined and complained and even tried to get the police involved (!!!) because they got scammed
by someone who wasn't even hiding the fact that he was running a Ponzi scheme.
Relevant links:
https://bitcointalk.org/index.php?topic=474730.0
http://www.reddit.com/r/Bitcoin/comm...investors_get/