When you are driving along behind someone who has a big sticker in their back window that declares "I love MY HUSBAND", don't you find yourself thinking "Methinks thou doth protest too much"?
What really gets me is when you are behind some male driver who is declaring "I love MY WIFE". Do you really know any man in this universe who would be moved to stick one of those things on his car? You know there's a suspicious or jealous wife behind that sticker, trying (probably in vain) to shield her property.
Cynicism appears to be the mood du jour.