Which of the following cartoon characters did Justin Bieber sometimes have nightmares about?

Explanation

Justin Bieber is a loving and caring person, but there are things that he doesn't like: the dark (achluophobia), small rooms (claustrophobic), UGG boots, waiting, being asked his favorite color, getting up in the morning, the cold, being too hot, when girls are trying to impress him, people pretending to be someone else, chocolate, cold toilet seats and Scooby-Doo.