It's Whose Line is it Anyway. Almost everything is improvised.
Drew Carey and Aisha Tyler's colorful introductions of the actors are improvised.
Drew Carey's comparisons of The Points Don't Matter were always improvised.
In Superheroes, the Superhero names of three of the actors are improvised.
And all of these were always posted on the wiki pages.
The Film Dub for Episode 14-16 is from the movie series the Range Busters called Trail Riders (1942) and here's the youtube link to find it from https://www.youtube.com/watch?v=UN7cU8--qO8 and go to 24:10 for that scene