I cannot stand it when someone comes within 10 feet of my car while cutting into my lane and they don't use a blinker. To me that says they feel like they are the only ones that matter and they are giving you the middle finger. I see it becoming more and more common.. where literally half the people that cut in front of me don't use a blinker.
Also, a runner up.. when people are in front of you in the city, they start to slam on their breaks and then turn without using their turn signal... that comes in a close second on the piss-me-off-o-meter.
It's fine if there is no one else NEAR you... I sometimes still use my blinker even if I am all alone on the road at 4 am. So I wanna hear if this irks other people as much as it does me? I find myself in a bad mood driving on a regular basis.
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Edit: I just realized I spelled "Brakes" wrong.. my bad.