Here is some info nygrl232 I found online about yelling "fire" in a crowded theater. Not sure how accurate this is but is what I have been told for years. Maybe if there is a lawyer here they can tell if true or not.
Can a person be prosecuted for yelling fire in a crowded building when there is no fire?
Answer
Yes, it's called Reckless Endangerment. When you make an action like that intentionally and knowing that there is no such danger, it encourages an action in the crowd that you would have probable reason to suspect panic. People get injured in panics. To put people in danger knowingly and without justification is illegal in all states. But get hold of a lawyer for specific citations.
Answer
Yes, freedom of speech only pertains to things that do not endanger others. Yelling "FIRE!" in a crowd will get you arrested. It can cause unwanted panic and people can be injured.
"I hope your Fanny is bigger than my Peter."
Mary Martin to Ezio Pinza opening night of Fanny.