I'm currently riding with a friend back home from our killer beach trip, and he is horrible at driving.
How often do you ride with someone else driving? I don't ride with others often, but it drives (lol) me crazy when he's busy looking out his rear view mirror at someone driving "recklessly," while I have to remind him to look forward at the cars that are stopping....
Also he plays that Punch Buggy game, so he's already kind of a dick....
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Distract him as much as you can.