Bad Grandpa is the fan-favorite skit from the show Jackass, where Johnny Knoxville pretends to be an old man to see how much shenanigans he can pull off, stretched into an hour and a half film. There were certainly some hilarious scenes but unfortunately they tried to turn it into a somewhat serious movie. I don't mean the content was serious, I simply mean that they actually tried to give the film a real plot and story arc and at times it seemed as though that interrupted the humor. About half of the skits are funny and a few are legitimately hilarious but the rest is mainly filler in order to connect the timeline. That was where the movie failed, in my opinion. If you're a Jackass fan, like myself, you won't mind and you'll still enjoy it to an extent. If you're not, then the humor probably isn't for you anyways.
Review of Jackass Presents: Bad Grandpa
