One example where it shows that the actor doesn't just provide a face, but, well,the acting, is back to the Future. Originally they had wanted to cast Michael J

One example where it shows that the actor doesn't just provide a face, but, well,the acting, is back to the Future. Originally they had wanted to cast Michael J Fox, but he wasn't available. So they picked a different actor. And that actor didn't get that the movie was supposed to be fun. They shot several weeks with this actor who was turning the movie into something very serious, being terrified by being transplanted into the past, and finding it tragic to come back to a present where everything is different. Theres a good documentary about this [1], that talks about replacing that actor, and when Fox comes on set and delivers the first line filmed ("You put a time machine... In a DeLorean?!"), it's hilarious, night and day difference. [1] season 2, episode 1 of movies that made us www.netflix.com/us/title/80990849