I often honk by horn repeatedly and obnoxiously to get the attention of another vehicle that happens to come to a stop at the sametime I do.

Having noticed a series of pro-Bush stickers upon the bumper of a super-sized Hummer, I respectfully roll down my window and explain to the driver:

"Sir, you must not be aware of this but some asshole has put a number of bumper stickers on your truck that endorse George Bush and Dick Cheney or John McCain."

"It's certainly obvious that this is clearly a malicious act.  And for the benefit of sanity I suggest you pull over right now and remove them before anyone makes the connection between you and a president that has ensured that filling up the tank of your vehicle might only be feasible on payday alone."

Good Luck, sir.