I hate it when someone drives by with a bad muffler. That "RRRRRRRRR" noise grates on my last nerve. Get it fixed!
I was outside walking the dog one day, like 6 or 7 in the morning, and some guy in a truck on his way to work, probably, comes "RRRRRRRRRRR'ing" by. I didn't mean to turn and look, since I don't want him to feel any worse about it than he probably already does. But before I could check myself I had turned.
He looked right at me and waved. So that's better than fingering me for looking at him.
I've had bad mufflers a few times in the past. It's embarrassing. So I've gotten them fixed as soon as possible.