There are two things that Vegeta would likely never do—hide from something and cower behind Goku. Fans see both of these things happen once the powerful Saiyan fusion Gogeta is absorbed inside Super Buu. Once inside Super Buu, the fusion is separated and the pair begin to explore Buu's insides. That's when Vegeta's little known fear is revealed. The Saiyan Prince is actually seen darting behind Goku after being approached by roundworms.