Turkeys are stupid and angry. I think the only bird less intelligent than a turkey would be a guinea fowl, but they have the edge of just being suicidally dumb. I've had a Guinea run away from my car and then back in front of it in confusion, but never have I had one openly charge my vehicle. I've had a turkey do that, though.
Wait. Are seagulls worse than black swans? Are they worse than Australian Magpies? I mean these surely got to be the top three worst birds, personally I'd prefer a seagull to a swan, but I've met enough magpie haters so I wouldn't be so sure everyone agrees