Here are some funny bumper stickers. Many of them have religious overtones (since it is the Xmas Season):

Jesus Saves Sinners...And redeems them for valuable coupons!

Jesus saves but Moses invests

My Wife Thinks I'm at PromiseKeepers

God told me to hate you

I'd rather be dead, than Red. [picture of blue/red America]

"A working class person who votes Republican is like a chicken who votes for Colonel Sanders."

"My Karma Ran Over My Dogma."

Never underestimate the power of stupid people in large groups

Mean people suck, but nice people swallow

"No, YOU suck -- sincerely, the Mean People"

"Visualize Parking."

"One nation under surveillance"

"Protect the Constitution- Vote Democratic"

"Do not meddle in the affairs of dragons, for you are crunchy and good with ketchup."

Will you be a Weaver of the fabric of our Democracy, or will you be a Moth?

In the event of the Rapture, can I have your car?

You can safely assume that you've created God in your own image when it turns out that God hates all the same people you do.

Democrats: We believe in fiscal, economic, social, civic, personal, and moral responsibility. Republicans: We take risks with your future.

"The problems of today will not be solved by the same thinking that produced the problems in the first place" - Albert Einstein

Get out of your damn SUV and join the Army! That's how you can support the troops.

Truth - Equity - Peace - That's what I've learned from The Original Liberal - Christ

"Your Honor Student Will Be Paying for Bush's Tax Cut"

"How fortunate for leaders that men do not think"-- Adolf Hitler

My Child Was Student of the Month at Skipworth Correctional Facility

I drive this huge truck to compensate for my little penis

God was my co-pilot, but then we crashed in the Andes and I had to eat Him

Dyslexics of the World, Untie!!!

Please feel free to add more!