"Dirty Grandpa" stars Zac Efron as a newly married man who's a complete stiff in life. He's mild-mannered and very cautious about life in general, and now he has to accompany his grandfather (Robert De Niro) on a road trip after said grandfather's wife passes away. The problem is that De Niro's character is the single most perverted, crude old man you can envision and now it's him hitting the road with his square of a grandson.
Right off the bat, this movie makes it perfectly clear what type of humor it's putting on display: Crude jokes relating mostly to sex and partying. If you're into stuff like that in a comedy and you like it being shoved in your face throughout the whole film, this movie is perfect for you. I personally think that raunchy gags can be funny in a movie when done right, but this isn't the movie to pull that off. As far as the raunchy jokes go, there's no cleverness to any of it. No wit, no smart set up, just a dirty joke here and there and then it's done for. One of the jokes in the movie is Robert De Niro being caught jacking off...and that's it. This movie thinks that the sight of an old man masturbating is funny enough to pass off as a real joke, but there needs to be more to it than just having an old guy tug one out for shock value. All of the jokes in this movie are just there for shock value and none of it worked.
This movie is also incredibly predictable for the type of story it's telling. You have a man who's just been married to his demanding, overbearing wife and now he's on a road trip with his wild, free-spirited companion who emphasizes loosening up and enjoying life. If you've seen any road trip movie ever made, you should know exactly how this movie is going to play out. If you can't guess where the movie is going, then I'm sorry for the fact that you've been living under a rock your whole life, and I'm sorry that you've apparently never seen any movies ever.
With the predictable, cliched story and the unfunny jokes that are only around for the sake of trying to shock people, the only positive thing in this movie for me was the comedic chemistry between Efron and De Niro. At this point in his young career, Zac Efron has proven that he's a good actor who can do more than just "High School Musical" crap. He's a genuinely talented comedic actor who knows how to play well off of De Niro, one of the most talented actors ever. De Niro knows comedy and he can do it well. Thankfully, these two funny actors manage to make the movie watchable in just a couple of moments. You can tell a lot of their stuff is ad-libbed and I honestly enjoyed seeing those scenes. The problem is when they start having to read off of the painfully unfunny scripted jokes. Had this whole movie just been Efron and De Niro ad-libbing everything, I truly believe this movie would've been a lot funnier than it actually is.
In short, "Dirty Grandpa" is an unfunny movie with a story that plays out exactly how you picture and it tries WAY too hard to get laughs out of being a risque, crude display of jokes involving pedophilia, overdone expletives, and brief shots of certain elderly appendages. Road trips movies seem to be getting worse every single year and I think it's time we just put them to rest and accept that nothing is going to beat the original "Vacation" or "Planes, Trains, and Automobiles".
Rating: Some Ol' Bullshit