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The Grim Adventures of Billy and Mandy: 2x26

Billy and Mandy's Jacked Up Halloween

Billy, Mandy and Grim go trick-or-treating for Halloween, and Irwin is left behind because he needs a scarier costume. After pulling a trick on an old lady, and getting some candies, Grim tells the story of why people pull pranks, which he was partially responsible for.

The Grim Adventures of Billy and Mandy: Season 2 Episode 26
The Grim Adventures of Billy and Mandy: Season 2 Episode 26
The Grim Adventures of Billy and Mandy: Season 2 Episode 26
Oct. 31, 2003