10 Movie Takes Actors DIDN'T Expect To Be Used

10. "Don't Lose Your Dinosaur" - Step Brothers

Let's kick things off with one of the funniest and most memorable scenes from any comedy movie of the last 20 years. 

Near the end of Step Brothers, Robert (Richard Jenkins) encourages his son Dale (John C. Reilly) and stepson Brennan (Will Ferrell) to embrace their inner child, offering up an analogy that, as a child, he always wanted to be a dinosaur.

However, his father eventually told him to put down childish things, causing him to "lose" his dinosaur, at which point Robert tells the pair, "Don't lose your dinosaur."

It's an absurd yet hilarious sequence, and yet, one which wasn't actually in the original script. 

During a 2018 interview on The Rich Eisen Show, Richard Jenkins revealed that filmmaker Adam McKay simply told him to tell Reilly and Ferrell that he wanted to be a dinosaur as a child.

Though Jenkins didn't really understand the request, he nevertheless complied, ad-libbing a monologue.

Once McKay called "cut!," however, Jenkins assumed that the monologue simply didn't work and wouldn't see the light of day, only for McKay to promptly inform him that it would absolutely end up in the movie - as, indeed, it did.