Bad Grandpa

D: Jeff Tremaine
Paramount/MTV (Johnny Knoxville, Jeff Tremaine, Derek Freda & Spike Jonze)
USA 🇺🇸 2013
92 mins
W: Jeff Tremaine, Spike Jonze & Johnny Knoxville
DP: Lance Bangs & Dimitri Elyashkevich
Ed: Seth Casriel, Matt Kosinski & Matthew Probst
Johnny Knoxville (Irving Zisman), Jackson Nicoll (Billy), Catherine Keener (Ellie), Georgina Cates (Kimmie), Spike Jonze (Gloria)
From the team that brought Jackass to our screens, you know before even watching that this going to be as low-brow and gross-out as you can get.
It's all just a series of hidden camera sketches with Johnny Knoxville laden in incredibly convincing old man makeup, trying the patience of regular folk as he pushes the boundaries of bad taste. 
For the most part, it's astonishing to see people reach the end of their tether with what they see as an elderly fellow acting like a complete jerk as he goes on a cross-country trip with his 8-year-old grandson.
Some jokes are funny, but for each good one there's three questionable ones and it's clear too see that a few of the situations are staged.
The whole movie ends in a joke which was done so much better in Little Miss Sunshine (qv).
Overall, this kind of humour worked better in films like Borat & Brüno, where the reactions seemed a little more genuine and the situations were far funnier.
Perhaps it would have worked better pared down as a one-hour TV special. As a feature-length movie, it's more embarrassing than it is amusing.

Bad Grandpa
Bad Grandpa
Did You Know:
Jarrod Brom, one of the segment producers on the film, asked his bride-to-be if she would let the production prank their wedding on the condition that none of their friends and family knew what was going on. She only had two stipulations: that the ceremony itself would not be affected, and that her dress would not be harmed.