YES yes and YES!!!
We have done this twice, believe it or not, but we forgot our sunglasses!!!
Now before you say "DUH", how do you forget those, it is florida.
Our first trip to WDW, we are from Michigan, we went in March so we didn't really think of it. So of course it was wonderful to say "oops, and get to buy new ones".
However fast forward 1&1/2 years later to trip 3.....we should've remember the sunglasses!! But guess what....got down there and whoops, no sunglasses. This time it wasn't as fun buying $50 worth of a souviner that we didn't really need.
I couldn't believe we did it twice and a little over a year apart.
Also on our first trip (again it was march and we are from Michigan) we didn't bring sunscreen. (another DUH moment but hey we are not use to the sun this time of year).
So we ended up paying $13 for a bottle of sunscreen!
You have to laugh at such stupid things to forget....or cry, I choose to laugh.