"Once people saw that, 'wow, this guy is actually somehow going ... I need to disavow him on my car somehow,'" Hiller said. Interest in the stickers comes from all over. Hiller has received ...

But occasionally, a little bit of color emerges on the back of the car in front of you—a bumper sticker can turn a dull commute into a moment of joy or give you something to think about for the ...