12. Jim Carrey needed torture-endurance training because the make-up was too much, How The Grinch Stole Christmas
14. Sean Connery had his wrist broken by an intense (and, now, infamous) instructor, Never Say Never Again
16. Sigourney Weaver made the "impossible" basketball shot for real, Alien Resurrection
View this video on YouTube
In case you ever question if Weaver is truly as badass IRL as she is in all of her movies, just take a seat for this one. In the script for the fourth Alien movie, she was required to throw a basketball behind her into the net, without ever looking. While the production team had completely planned on using CGI for the trick, they still needed to film her throwing it...and she ACTUALLY MADE IT IN. TBH, the smile on Ron Perlman's face tells the whole story.