Zettai Zetsumei Dangerous Jiisan (2004)

Zettai Zetsumei Dangerous Jiisan is an anarchic and absurdist anime centered on the chaotic daily life of Grandpa Danger, an elderly man whose existence is a never-ending series of bizarre, self-inflicted crises. The plot revolves around his outrageous attempts to protect his long-suffering grandson from a world he perceives as filled with peril, though his methods are the true source of danger.

The humor is derived from Grandpa Danger's relentlessly grotesque and nonsensical antics, which include an overabundance of bodily functions and a complete disregard for common sense. This creates a hilarious battle of wills between the utterly shameless old man and his perpetually frustrated, more sensible grandson. The anime thrives on its over-the-top, surreal comedy and the theme of enduring the most eccentric family member imaginable.