Arthur Season 6 Episode 10 Arthur Loses His Marbles / Friday the 13th >Brain does not believe in superstitions and tries to prove his hypothesis by doing things superstitiously believed to bring bad luck, like walking under a ladder, stepping on a crack, and destroying a mirror. Counter to his hypothesis, a streak of bad luck strikes. Brain goes to Buster to get lucky charms, but during a baseball game on Friday the 13th, Brain forgets the charms and hits a home run that wins his team the game, proving his hypothesis.