Some of them bug me, some I find interesting or amusing.

D.A.R.E stands for Drug Abuse Resistance Education. It's a program promoted by police departments to help kids avoid getting into drug use. Its effectiveness is being questioned now that it has been around long enough to start evaluating the results.

"Baby On Board" signs irk me because I see them as saying "My car's passengers are deserving of extra caution on your part." So it's not so bad if I plow into a car that contains only adults? Furthermore, the great majority of the time the baby is not on board, making the notice dishonest.