さんだんオチ
Meanings
Noun
1. three-part joke, where the first two parts are similar and mundane, while the third is the punchline (e.g. How do you get to my place? Go down to the corner, turn left, and get lost.); rule of three (in comedy writing)
Composed of
third stage; three stages
slip; omission; upshot; denouement; punch line (of a joke)