Wikipedia
Nininbaori
is a Japanese comedic act where two people wear the same large coat ( haori) and pretend to be one ( hunchbacked) person. One person is the "face" and the other is the "arms". Humor arises from the arms never being coordinated with the face.
This type of skit is considered a staple of Japanese comedy, traditional and modern, and is commonly used as a part of comedy shows; both live stage performances and Owarai (television comedy).