Ron, I clear my Mom's car off if I am going with her--and I mean completely. I clean off the top (my pet peeve--people leave the mound on the top) and the headlights too.
Mike, that's a good one too!
Mine is people (ok mostly "old people") who go to the grocery store and block the aisle staring at the shelf. I'm sure they are magically thinking the can will talk to them that they need to buy that.
AND college age students who turn their ipods up to deafening sounds. I don't want to hear your "music". They also talk on their cellphones when they are 5 mins away from home and they swear constantly.