one day you think it's a good idea to make a political statement, declare your love for corgis, or encourage other drivers to "honk if you like my driving" and the next thing you know global warming isn't real, you hate corgis and now favor the doberman, and you're just tired of being honked at. then what? it's not like you can just peel the sticker off.
i think what i appreciate most is that bumper stickers give you a tiny glimpse into the psyche of the car's owner. in less than six inches they can express religious or political beliefs, identify hobbies, or tell you what the driver would rather be doing. but regardless of what they say, you always want to look in the driver's window as you pass them--if only to confirm that the driver looks exactly as you thought they would (this never happens, btw).
in a way, i kind of admire people with bumper stickers. imagine feeling so passionately about something that you'd commit real estate on your car for eternity. i feel like committing to marriage is an easier, more realistic proposition.
if you had to put a bumper sticker on your car, what would it say?