Mine would say: "If there weren't so many of us, you'd be home by now."

Another good reason to keep an airsoft pistol in your glove box.

That would be obnoxious if I was stuck behind him. Too bright, not to mention annoying.

I would yell out of the window "If you don't turn that shit off I'm gonna cut that wire".

I'd just have a countdown timer "xx:xx til detonation."

I see these all the time in the asian lunch shops lol.

Mine would say, "Only assholes tailgate. Back the fuck off."

Are those even legal?

I have wanted to put one of these atop the windshield and rear window for use in traffic. The one in the windshield would show backwards text so it could be read in a rear view mirror and both units would appear black and not be easily seen when not in use. Messages would be pre-programmed with sayings like "learn to drive" or "move the hell over, moron" or "use a turn signal next time" or "turn your lights on or die" or "find a cop hand him your keys" or "hang up" or "stop texting" etc...

^ Yeah, I would put mine on the front and it would just have an infinite succession of arrows pointing to the slow lanes.

Mine would say: WhyDoesYourFaceLookLikeYourButt?WhyDoesYourButtLookLikeYourFace?WhyDoesYourFaceLookLikeYourButt?WhyDoesYourButtLookLikeYourFace?

Mine would say; "Get off my ass!"

mine would say get of the phone?or wtf get out the left lane.or cach me if u can

Mine would say, "Stop trying to read this, and get out of my way!!"

Obnoxious. If neon underglow is illegal while your driving than why would a neon sign be any exception