This Is Not A Good Thing
I drove to work behind someone with a bumper sticker similar to this one:
Let me very clear -- from a sentiment perspective, couldn't agree with this more - I DO love my wife, and if more people in the world were like her, the world would be an infinitely better place.
But there's really only a few reasons you put something like this on your car:
You screwed up REALLY badly.
Your wife expects you to screw up REALLY badly
You are planning to screw up REALLY badly
Your wife put it there (perhaps because of #2) and would be crushed if you removed it.
Your friends put it there to mock you for being whipped.
There's probably more reasons, but I honestly can't think of a good one here. As Chris Rock once said about other things, "You shouldn't brag about things you're supposed to do!" (Of course, he also starred in a movie called, "I Think I Love My Wife," then allegedly cheated on her, if memory serves, pretty much making his own point.)
In any case, my point here is ... YIKES. If you have one of these on your car, you need to check yourself, my friend.