I just did a search on this topic, and found that there is no bumper sticker string in the forum.

Since the summer driving season is upon us, especially in an election year, this would seem to be a good topic.

I'll start...

I89 Drive it if you can!

A take off on the Mad River Glen sticker, referring to the abysmal condition of I89 from Montpelier to Waterbury.

My all-time favorite bumper sticker I saw several years ago demanded that we "Reunite Pangaea" (look it up).

My kids and I busted a gut the day we saw: "I love cats. They taste just like chicken."

We have 3 cats at all times as there is open space behind our house and it is a dumping ground for people getting rid of unwanted animals. That bimper sticker just caught us off guard as the second sentence changed the meaning of the first sentence!

"If it's Tourist Season, why can't we shoot them?"

How long a minute is depends on what side of the bathroom door you're on.

A truly happy person is one who can enjoy the scenery on a detour.

Ever notice that the people who are late are often much jollier than the people who have to wait for them.

Some mistakes are too much fun to only make once.

My kid beat up your honor student

DAMM - Drunks against mad mothers

More honor student ones:

My kid got your honor student pregnant

My kid sold drugs to your honor student (pretty truthful at my high school)

Parental discretion advised for some of these, lol:

As long as I have a face, you'll have a place to sit

I wasn't speeding, I was qualifying

Welcome to Colorado. Now go home

Change is inevitable, except from a vending machine.

The gene pool could use a little chlorine.

I didn't fight my way to the top of the food chain to be a vegetarian.

Time is the best teacher; Unfortunately it kills all its students!

Make it idiot proof and someone will make a better idiot.

Lottery: A tax on people who are bad at math.

I like you, but I wouldn't want to see you working with subatomic particles.

My favourite one (kind of related) was a license plate on a white Volkswagon Rabbit that read ML8 ML8!

A reference to the white rabbit in Alice in Wonderland "I'm Late, I'm Late!"

Seen in Key West: "Key West is a party town with a tourist problem."

"Regime Change Starts at Home"

"Stop Tailgating or I'll Flick My Booger on You"

"Bush Won't Be Re-Elected - He'll Appoint Himself Emperor"

"Imagine 5 Pound Bass"

Oh, and one of my favorites...Not a bumper sticker, but written on the back of a septic tank truck:

"We're Number One in the Number Two Business..."

Hang up and drive.

Live Aloha

and my all-time favorite:

186,000 mps--It's not just a good idea, it's the law!

"My son/daughter is an honor student at (name of high school)", which led to

"My kid beat up your honor student"

& in rebuttal and my all time favorite is:

"My honor student will operate on your kid's prostate"!

Friends of mine have this one on their car: "Visualize your turn signal".

On a 1980 Datsun 210

0 to 60 in 15 minutes

Democracy was getting old any way

Imperialism: A way of life worth bombing for!

I wasn't using my civil liberties any way

One person, one vote (may not apply in some states)

Visualize whirled peas!