Zettai Zetsumei Dangerous Jiisan (2004)
絶対絶命でんぢゃらすじーさん (2004) • Grandpa Danger
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...
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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)