Watch Bad Grandpa Online A comedy where a public farting contest between a pre-teen boy and an eighty year old man ends with someone sharting — you probably don’t want to look that up — all over a restaurant wall is, let’s be honest, not all that surprising in 2013.

Watch Bad Grandpa Online So Bad Grandpa adds a twist: they do it live in front of an unsuspecting crowd of real-life patrons. If it sounds like the kind of thing that worked in Borat, then not quite as well in Bruno, then only occasionally in The Dictator, you’re right. But with Sasha Baron Cohen having discarded the prank movie formula, why shouldn’t the Jackass team have a bit of fun with it?

Watch Bad Grandpa Online If you’ve seen the previous Jackass movies, you know that one of their regular bits involved someone (reportedly arthouse director and regular Jackass contributor Spike Jonez, who co-wrote the script here) being made up to look like an old lady then going out to do a bunch of things (often involving saggy body parts) that an old lady wouldn’t do. So yes, in some ways this is a movie-length version of that. But if you’re going to base your movie on a one-joke idea, why not use a really funny one?

Watch Bad Grandpa Online Irving Zisman (a heavily made-up Johnny Knoxville) has just lost his wife and he’s looking to party (much to the horror of the real-life doctor’s waiting room he informs). Meanwhile his daughter is going back to jail on drugs charges having violated her parole, which leaves eight year-old Billy (Jackson Nicoll) on his own and telling strangers “my mum has bad breath because she smokes so much crack”.