Luigi and the Sewer Pipes

Luigi's Shorts Season 2 - Episode 6: Luigi and the Sewer Pipes

Episode #: 16

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Overview
Luigi makes it through the Sewer Pipes and enters an underground cave. Luigi explores. He gets bored, and then Boo pops out of the sewer pipes. When Luigi sees this, he tries to run away, but Boo posseses him. Boo, while in Luigi's body, is saying, "I... am the...ghost of the...bathroom...". Luigi fights and pulls Boo out of his body, then tells him he needs to leave. Boo again posseses him. Boo says the same thing, but after the first time, Luigi says "and you need to get out of me!" and pulls him out. Boo leaves, giving up on Luigi. Luigi then goes through the exit of the cave and into the bright sunlight.

Trivia

 * Boo leaves but comes back in The Last Battle.