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!
In the meantime, I shall continue to be the local grammar-Nazi: