I have a few to add
The first isn't from a WDW line but it was overheard at the Red Lobster at Crossroads, so pretty close to WDW
It was a few years ago, my best friend and I were heading to the restroom and a Mom and 2 daughters (8 and 10 maybe) were just in front of us. The girls get into the restroom and the younger yells "I call handicap" and darted into the handicap stall. My friend and I looked at each other with bewildered expressions and nearly died of laughter, even the Mom was cracking up. It was just so random!
The next was last year. We were heading through Adventureland and as we passed the tunnel that goes through to Frontierland we hear a little boy "Noooo! Don't make me!! I don't want to!" and we looked around out of curiosity. The boy was in a stroller, maybe 4 years old and his Mom was heading into the shop on the corner of the tunnel in Adventureland. He continued "Please....no more shopping!!"
My mom and I cracked up on the spot.
I once heard a couple refer to the Tower of Terror as the Tower of
Fear and I thought...close....but not quite....doesn't have the same ring to it does it?
One of the best came from my DMom. We had a very long travel day (up at 6, connecting flight etc.) and it was about 2pm by the time we were driving to our resort. We were staying at the Poly so we had to drive through the MK gates to get there. Keep in mind this was our...30th or so, trip to WDW.
DMom: What does that day?
Me: What does what say Mom?
DMom: The sign, above the gates.
Me: The Magic Kingdom?
DMom: No...the one that is spaced out...W...E...L...C...welc? what is that?
Me: Um...you mean the one that says "welcome"?
DDad: *LMAO*
DMom: .....yes....that one....
shut up i'm tired....LOL