The word definitely is my pet peeve, that one is slaughtered quite a bit! You all have made me laugh with this thread.
I have a question for the grammar experts out there. When you get welcome sign for your house (the kind you stake into the ground, or hang on your front door), and your last name is SMITH, which should be printed on the sign, should it read:
THE SMITHS
Or
THE SMITHS
Now, I think it is the first option, plural. The sign does not say THE SMITHS HOUSE then I would agree it should be a possessive S. I am correct?
A more specific example is this, last Christmas I bought engraved wooden signs for all of DHs siblings. It was a fireplace with stockings hanging off the mantle, the last name was on the mantle and the familys first names were on the stockings. On the mantle we engraved THE SMITHS. MIL told DH I did it all wrong, but it was still a nice gesture.

I still think I was right.
Last example, when we sign our Christmas cards, we do it like this:
MERRY CHRISTMAS
LOVE,
THE SMITHS
CINDY, JAMIE, AIDAN & KADE
Have I been doing this wrong for years, and years, and years (how embarrassing LOL)?