I think my favorite quote used by us is "There will be NO unscheduled fun today!"
Hee hee. DH didn't understand my touring plans the first time we went (Now he LOVES them) and when he wanted to do something that he thought was a good idea at the time, I told him, no, we can't do that now and he responded with that quote LOL! TO be fair, he wanted to get a character's autograph while the line for Dumbo was getting longer by the second. We DID get that autograph - while we sat and ate at our character meal, that character CAME TO US. That is when he "got" it LOL!
We now use that just about daily on our vacations.
Oh and another one I overheard ... "What's a Philhar?"