This is a special that promoted the release of the movie "Gekijouban Kanketsuhen Gintama: Yorozuya yo Eien Nare", where the characters take on the appearance of a "mameshiba" that are nothing more than a bean that have dog-like faces and tell trivia, that are part of the merchandise of Japanese franchise created by copywriter and Korean Japanese national Kim Sukwon.
As in the anime, the characters make jokes with each other in the short time of the episodes.
For those who are Gintama fans, don't hurts to check.