What's something about filmmaking that blew your mind?

When you were a kid or maybe a tween/teen (or perhaps an adult), what's a behind-the-scenes fact about movie making that stunned you?For myself, it was learning most films aren't shot in chronological order. My young mind literally couldn't compute for a second 😂. I thought I was pretty knowledgeable as a kid, as I used to watch the "making of" snippets some films had at the end of their VHS and visual effects specials that used to come on TV (remember those?). I was floored, but it makes perfect sense. What about you guys? via /r/movies https://ift.tt/39wVEvq