Earlier quoted context omitted.
529C39CC24553DFE030119BD35E19884F34A65E0 Free speech or theft?
Context matters. I can yell FIRE in my own home, but I can't go into a crowded theatre and yell it. The hash as you post it here is meaningless. But elsewhere it could be the key to another's property.
But if nothing happened then there should be no reason to make your exclamation illegal.
Of course you could still be thrown out of the theater for disrupting the performance, providing further disincentive for doing something like that, but that's separate from the legality of your speech.