Zettai Zetsumei Dangerous Jiisan (2004)
Japanese title: 絶体絶命でんぢゃらすじーさん
Alternative titles: Grandpa Danger
Type: TV
Source: Manga
Episodes: 51
Status: Finished Airing
Aired: Apr 4, 2004 to Mar 27, 2005
Broadcast: Unknown
Duration: 5 min per ep
Rating: PG - Children
Studios: Studio Hibari
Producers: Shogakukan, Shogakukan Productions
Licensors: VIZ Media
Genres: Comedy
Demographics: Kids

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!

(Source: AniDB)