1.In some of the great hall scenes in the first two Harry Potter films, the food on the table had been left out for days, meaning the entire cast had to pretend they weren't sitting in front of tables of stinky rotten food.
10.We all know that Indiana Jones and the Temple of Doom had that one scene where there were loads of bugs. What you might not know is that Kate Capshaw had to take a valium to get through the sheer amount of bugs that were crawling through her clothes.
11.Tony Todd had his face covered and his mouth filled with real bees in Candyman, and he was paid a bonus for each sting he received.
14.After snorting so much fake cocaine on the set of Wolf of Wall Street, Jonah Hill ended up in hospital.
15.The iconic opening of The Sound of Music captured Julie Andrews frolicking around in the hills, a picture of elegance. What we don't see is the multiple times she faceplanted into the muddy grass after being swept up by the strong winds from the helicopter that was used to film the scene.
17.And finally this bonus one – because it didn't actually happen on set, but I think it shows some serious dedication to the craft – Timothée Chalamet got up close and personal with a peach ahead of filming the famous Call Me by Your Name scene.
When did an actor's dedication to their job blow you away? Tell us in the comments!