Harry Potter and the Chamber of Secrets
Kids can be just as clever as some adults writing these screenplays. Tom Felton, famous for playing Draco Malfoy in the Harry Potter franchise, came up with this clever joke when he forgot his next line. When one of his cronies said he used glasses to read, and he quickly responded with "Reading? I didn't know you could read." They kept it in so he'd be seen more as a bully than a villain, an important distinction in the Harry Potter universe.