Friday the 13th

Friday the 13th is the second half of the 10th episode of Season 6. It first aired on November 26, 2001 with "Arthur Loses His Marbles".

Summary
Brain doesn't believe in superstitions, even though his friends step over sidewalk cracks, and even Mr. Ratburn walks around ladders. So when Brain's defiance leads to a string of bad luck, he's stunned. Can he reverse the trend before the unluckiest day of them all -- Friday the 13th.

Quotes

 * Brain: What scary movie are we watching?
 * Buster: 'I Know What you did Last Wednesday'.
 * Brain: I went to school and then the library, so?
 * Buster: No, that's the name of the movie we're watching.
 * Arthur: It's the sequel of "I Know What You Did Last Tuesday".

Trivia

 * If Brain hit a home run it wouldn't make much of a difference since the team was down 10-0.