What really upsets me is audience discrimination. I remember during 70 Girls, 70 at Encores, the second my friend and I sat down, these very old women in front of us began scowling. Noticeably. The show began, and after one number, DURING the applause, I turned to my friend and spoke for the first time during the performance, quietly whispering just, "Omigosh, that was amazing." Two of the women turned out and SCREAMED very nastily, "Can you PLEASE keep it down, CHILDREN?!" It was horrifying and really upset me since I was very excited to see the show, and was not being disrespectful in any way. (Also, I am sure a college student is not a child.)
One of the worst examples of bad audience behavior I've experienced was during a performance of Dirty Rotten Scoundrels, when a man answered his cell phone and spoke on it loudly, four separate times.
[title of show] on Broadway. it's time. believe.