At ten years old, Bart is the eldest child and only son of Homer and Marge, and the brother of Lisa and Maggie. Bart's most prominent and popular character traits are his mischievousness, rebelliousness and disrespect for authority. Hallmarks of the character include his chalkboard gags in the opening sequence; his prank calls to Moe; and his catchphrases "Eat my shorts", ""¡Ay, caramba!"", "Don't have a cow, man!", and "I'm Bart Simpson. Who the hell are you?". However, with the exception of "Ay, caramba!", these hallmarks have been retired or are not often used. Bart has appeared in other media relating to "The Simpsons" – including video games, "The Simpsons Movie", "The Simpsons" Ride, commercials, and comic books – and inspired an entire line of merchandise.