In Jurassic Park when Lex falls through the ceiling, the stunt double accidentally looks up, so instead of filming the scene again, they superimposed Lex’s face over the stunt double.

I ended up clicking this video and then landing on Chuck Norris's explination of why Bruce Lee died.

Apparently (according to chuck) he had a reaction between a muscle relaxant he was taking for a back injury he had previously, and a antibiotic given to him by his costar.

There's a completely different explanation involving an analgesic, but as it turns out Chuck's description actually has at least one person indirectly supporting that theory in a medical journal.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3581776/

Apparently antibiotics and muscle relaxants can create problems when used together.

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