The Lord of the Rings: The Fellowship of the Ring
If you can jog your memory a little, think back to the moment that Aragorn screeched after believing that Merry and Pippin had died. So other than making perhaps the most emotional scene in all of the The Lord of the Rings, Viggo Mortensen was actually in crazy pain! He had kicked a helmet on set and broke his toe.
Harry Potter and the Chamber of Secrets
It has stood out as a memorable moment in the Harry Potter series. During Harry Potter and the Chamber of Secrets, Mr. Weasley asked the question, “What exactly is the function of a rubber duck?” You guessed it – it was never in the script; he made it up on the spot.