Scammers and 'When Mooners?' are what annoys me most. The rest I can deal with, those two annoy the hell out of me. Scammers for obvious reasons, and that includes both scam projects and scamming (cheating) bounty hunters. So frustrating when you follow the rules and see others blatantly breaking the rules and getting paid out. I know it's difficult for bounty managers, but most seem to not allocate the time or resources to deal with it. Can't really blame the scammers for trying, they're just taking advantage of a disorganised system, it's up to the projects/bounty managers to close the loop holes. If they manage to do that (or at least limit it), then everybody wins - apart from the scammers!