My personal mobile peeve – people who read/send text messages while driving. Even on a busy highway.
Look, I know I’m going to die someday, but I’d much rather go out “on schedule”, and not because you just HAD to text your sweetie in heavy traffic RIGHT THIS VERY MINUTE instead of waiting for a safe place to pull over. If it’s really that urgent, freaking CALL THEM. At least that way you’ll be staring at the road instead of your stupid phone screen.