I've always wanted to make one that says "Not MY Problem!" Since most drivers think "What the Heck is that driver's problem" when the come flying up on our arses. Kinda funny too since most of the time, in my case, there are one or two other lanes a person can go around me on instead of being retarded and sitting behind me. I don't think most of the population can think for itself anymore...free-thinking is becoming a rare thing.
Some days I wish my car was equipped with retractable paintball guns. Perhaps a locomotive horn would do the trick. Naw, I'll just take my frustrations out on the Grand Theft Auto series .
If you get to where you find some method to implement something like this, let me know, I might be interested. I thought about something like this, but a little more oblique, like a cherry tomato or grape launching device. That way they might not necessarily know that your doing it intentionally, but they would get off your back because the tomatoes make a juicy mess on the windshield and they probably can't figure out what in the world was that huge bug that just smacked the windshield.
A alternative I've considered was to put a largely soap mixture into the back window washer and squirt that at them. My son in law said I should just make it diesel oil, that way it makes a huge oily mess. Maybe I'm a poor influence.
shhh i know nohting of the sort of a potato "launching" device! or candle wax slugs heheeh harder than rocks and fit tighter than a bullet in a gun barrel. awww u made me say it...
but on a aside note way back in the 70's my dad put a model rocket launcher that fired out the front of his car down the road...
and no student driver signs... i honk at those people
but the other day i was all alone in the right lane and some guy ain a full size truck had to be doing 80 come sup behind me, passes me in the truck lane to my right and then swerves back into my lane, even tho noone was in the left lane... i wish i had a box of stickers that read "Look out i drive like a jacka$$" and follow the people to whereever thier speeding to and slap a few on thier bumper when they go inside.