Zettai Zetsumei Dangerous Jiisan (2004)

Grandpa Danger is a world where the great protector is Grandpa Danger! He's an expert at falling off of cliffs, dealing with a principal who suffers from a severe inferiority complex, and escaping the hidden dangers of sleep! He's a nonsensical, utterly disgusting, relentless prankster. Grandpa Danger's excessive phlegm and farts frustrate Grandson to hilarious extremes, and make you laugh until your stomach splits!

Agedama is a small boy going to elementary school and having the usual problems for a boy of his age. He is also secretly a superhero-in-training (called "Agedaman"). Along with Wapuro, his floating computer companion, he fights against a criminal organization who can turn humans into monsters of various types.

Another TV anime adaptation of Dangerous Jiisan Ja manga by Soyama Kazutoshi, serialized in Monthly Bessatsu CoroCoro Comic.

Imagine two irresponsible siblings (Fuko and Yoshiharu) living under the care of an equally or more irresponsible father (Amachi). Then add some bizarre stuff, like cobras, bad jokes, adult videos, seductive grannies, farting, stupid remarks and insults, terribly foul language, and a nonsensical plethora of strange happenings...