The shattered window in Blade Runner
In the now-famous scene starring Daryl Hannah’s Pris, as she’s running away in fear, she slips and destroys the window of a van. The shattering window made her frenzied escape seem that much more realistic, but in truth, nobody had planned for it to happen. That wasn’t a prop glass that shatters with the slightest nudge, either. It was real glass.
In fact, the freak accident was so bad that Daryl wound up in the hospital after recording. It caused her to break her elbow, and she has a scar that’ll forever remind her of her sacrifice. Oh, yeah, and the director kept rolling the cameras, so she also has footage of her horrible experience.