I accidentally entered my pet before I finished the description
Here's some lines from the movie to help you guess:
Character 1: "what?"
Character 2: "I'm still trying to work out if that horse is dumb, or pretending to be dumb"
I had to swap some words around in the lines above becuase they used swear words and those aren't permitted on the site, therefore the lines aren't a 100% accurate. I think this will be a hard one....