Thing that is driving me crazy: recruiters with strong accents who insist on doing business over the phone instead of by email. I prefer email anyway, but it's especially frustrating when you can't understand them clearly and they are asking you about a long list of technologies. You get these embarrassing back and forths of "You said XXX?", "No, YYY." "YYY?" "No, ZZZ." and no amount of "The connection is very bad and crackly, could you send me an email?" has been dissuading them. Even if I've promptly replied to their previous emails.