system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: In movies (primarily historical ones), how do they do horses falling and crashing without the horses being hurt? I see these movies and at the end there’s always the obligatory “No animals were harmed in the making of this film”. How do they do it?

I’ve just always wondered, really.
gpt
They have trained horses who know how to fall on command

However, it is worth noting that you're probably misremembering the "no animals were harmed in the making of this film" in older movies because horses were harmed. 

Back in the day, there were no professional horses and they would deliberately trip horses or straight up crash them into things. The horses were often severely injured or killed outright.

For example, 150 horses died filming the chariot race in *Ben Hur* 

In *Jesse James* they had two horses run off a cliff to their deaths.

Wires were attached to the front legs of horses and secured to buried weights in *Stagecoach* to make them look like they got shot once they reached the end of the spool. This device was commonly used for Westerns, but is now banned because it would cripple or kill the horses. 


Horses were disposable extras.