We've just returned from Moruya where we had a beautiful lunch - and I quaffed a glass (or two) of chardonnay - at the bowling club. On the way home, we drove behind a huge WINNEBAGO motor home that had "Happy Day's" written across its back.
At first I wanted to make a citizen's arrest; however, the chardonnay had sufficiently mellowed me to merely email their car registration number to The Apostrophe Protection Society.
Let them deal with this serious infringement of the rules of grammar!