and "Don't you know how to use flippers? ", while Bart says lines like "Don't have a cow, man," "Way to go, man," "You blew it, man," and "Hey, man, we're both underachievers."
Additionally, "Don't you know how to use flippers?" is said alongside Bart's remarks like "Don't freak out, pal," "Excellent effort, pal," "You failed, pal," and "Hey, pal, we're both not meeting expectations."