Also known as: 名探偵津田
A series of episodes in Suiyoubi No Downtown, which was originally called "Hypothesis: the Prank Where You're Trapped in a Mystery Drama until You Find the Culprit must be So Exhausting" (犯人を見つけるまでミステリードラマの世界から抜け出せないドッキリ、めちゃしんどい説) before Episode 3.
As the original title suggests, in each episode, Atsuhiro Tsuda of Manzai duo Diane is forced into the role of detective without notice and cannot leave until he solves the mystery.
In it, Tsuda started out oblivious to the concept of metafiction, which his reactions to the realization have gained memetic status.