This isn't nearly as bad as the others, but once while my Mom

and I

were in the stretch room for the Haunted Mansion, a family from England (?) proceeded to talk quite loudly through the whole thing. The family consisted of two parents and a boy and girl (both approx. 7 to 9 years old). The father was trying to scare the kids, "we're going to see ghosts... they're going to pop out at you... it's reallly dark... blah, blah, blah". Nobody could hear the attraction's audio track (the whole "Welcome, foolish mortals..." is one of my favorite parts

and all I could hear was these rude people.) When the stretch room opened, the father and son made a run for it, pushing through and getting right in front of me and my Mom.

The mother and daughter in the group ended up somewhere behind us. Instead of waiting for the rest of their party, the 'boys' jumped into their Doom Buggy and the 'girls' were about two or three buggies back, with me and Mom being one of the in-betweener buggies. We thought that was the end of the rudeness, but unfortunately every place in the ride where the buggies were side to side (ballroom scene) or facing each other (Madam Leota's seance scene) they proceeded to YELL to each other, "ARE YOU SCARED YET? DID A GHOST GET YA?"
When the ride was over, the 'boys' did wait for the 'girls' and then together pushed past everyone to run out of the exit screaming to each other about what ride to go to next.
For the life of me, I can't understand why half of the party pushed past other guests if they wanted to talk the whole time. We were all going to get on the ride for goodness sakes.