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When you spot some crap in your way just in time to yank the wheel like a maniac and avoid crashing into it, or you see someone else's skid-marks and think, 'Damn, that was close.'
I saw a raccoon in my lane and nearly drove into it. I swerved like a fool.
I saw some skid-marks and thought, 'That guy must've been drunk or high.'
I saw a kid on a bike and almost hit him. I almost cried.