I can't think of anything off the top of my head that I heard from someone else, but I've got one that *I* said. It's probably one of those you-had-to-be-there stories, but I'll tell you anyway.
It was evening EMH at Animal Kingdom, October 2008. DBF and I had just come out of Festival of the Lion King and were walking the long trail out of Camp M-M. It was about halfway through our week at the World and we had been in the parks from after breakfast till close every day. I was exhausted, so we sat down on a bench near Pizzafari.
I started going through all the characters we had met so far, and the ones we had to find still. I was *trying* to tell DBF that we would be meeting Mickey and Pluto at 'Ohana the next morning, but I was also thinking about how we hadn't run into Goofy yet. So out of my mouth comes:
'Well, tomorrow we'll see
Ploofy...' and I paused and then just LOST it.
I must have cracked up for 5 minutes, I was so slap happy and tired.

I'm fairly certain anyone that was around us must have thought I had lost my mind.

I kept screaming 'PLOOFY!!!! BAHAHAHA!'
Not nearly as funny when I tell the story now, but at the time, oh man...