The Hangover
Of course, Zach Galifianakis was incredible in The Hangover, but did you know he improvised one of the most iconic parts? Yes, he did some obscene and crazy things to that baby. Actually, Galifianakis was a bit embarrassed saying, “The one improv that will haunt me for the rest of my life, is the [ scene where I ] make the baby [unknowingly mimic a sexual act].” At least it was only a doll and not an actual baby. Well, the director kept it in the final cut since it was so hysterical.

The Hangover
Shaun of the Dead
During Shaun of the Dead, much of the cast fully improvised. However, we have to point out just one special moment in the pub. While Ed (Nick Frost) tried to console his depressed friend Shaun (Simon Pegg), he got into some intense stories about the regulars. Maybe you recall something about a female that looked like a former porn-star. Well, everything they said was made up on the spot. All the script said was for the friends to meet at the pub.

Shaun Of The Dead