(1) I can't stand when people remember the past or a conversation, differently than what actually happened. I have a great memory for past conversations/events, and frequently surprise friends and family with my accuracy of details. This is particularly annoying when they use these details to twist my own words, or a stance on an argument.
(2) When people are trying to merge (particularly when I'm in the car with them), and they get annoyed about nobody letting them over, or traffic being heavy, but DON'T turn on their blinker until the VERY last second before they physically move into the other lane. The blinker is there to alert other drivers you are intending to move over... how is it beneficial to flip on the blinker while already in the process of merging??
X2 on this. What REALLY REALLY REALLY gets to me is when people are late... My gf is always late....