Shouting "fire!" in a crowded place is probably more dangerous than you think, and sadly there are real-life examples of this.
"The Italian Hall Disaster (sometimes referred to as the 1913 Massacre) was a tragedy that occurred on Wednesday, December 24, 1913, in Calumet, Michigan, United States. Seventy-three men, women, and children – mostly striking mine workers and their families – were crushed to death in a stampede when someone falsely shouted "fire" at a crowded Christmas party."
More on Wikipedia:
https://en.wikipedia.org/wiki/Italian_Hall_disaster