Since i've only been to New York once, over the past spring, i can't make much comment on things i overheard. However, i think i should share the one faux pas i'm aware of making.
My school went with a tour group, and the rest of the group had voted to see
Tarzan as one of our three shows, which i was not excited about. I hadn't liked the movie and i didn't want to sit through 3 hours of Phil Collins music. Well, at intermission i turned to my friend who'd also been against seeing the show, and this happened:
Me: Wow, this is so much better than i thought it was going to be!
Friend: Yeah, the visuals are amazing!
Me: The music is actually pretty good too.
Friend: I know! I think it's because it's not Phil Collins singing.
Me: True, that helps a lot.
I'm poked by the person on my right
Other Person: Uh, guys, Phil Collins is here.
Me: Are you serious?
Other Person: Yeah, he's right there.
He happened to be sitting about 7 rows down from us. I was quite embarassed.
"Umm...A1 is a steak sauce."