なまくら刀（塙凹内名刀之巻）

Namakura Gatana, meaning "dull-edged sword," is a four-minute comedy about a samurai who, thanks to his dull instrument, loses every time he attacks a weak opponent. In order to examine the sword, he tries to attack passers-by, but lower-class townspeople fight back and knock him down.

(Source: AniDB)