When parents talk about someone who’d be a bad influence for their children, they’re basically talking about Hesher.
This 20-something vagrant, played as an anarchic, overgrown wild child by Joseph Gordon-Levitt, wears his hair long and greasy. He’s got a middle-finger tattoo in the small of his back, and he exhibits a pronounced fondness for drugs, pornography and blowing things up.
All of which, strange as it may seem, makes him exactly what 12-year-old T.J. and his family need in their lives. Which is lucky, because after T.J. accidentally gets Hesher kicked out of a house in which he’d been squatting, Hesher follows him home and without so much as word of introduction, moves into the garage, strips to his briefs, tosses the rest of his clothes in the laundry, and settles down to watch TV.
Normally, you’d expect T.J.’s dad to call the police, but this family isn’t entirely functional at present. Just two months earlier, they lost T.J.’s mom — the circumstances will be revealed later — and now Dad is being medicated for depression. Granny isn’t really all there even on good days. And the path of least resistance is simply to set another place at the table, so T.J. realizes pretty quickly that like it or not, Hesher is now part of his life — albeit an entirely inappropriate part.
Now, in most movies, this would be the moment when the anarchic wild-child starts to develop a protective side, helping the family deal with its trauma. In this case, Dad could use a wake-up call, and T.J. could use help dealing with a school bully. But Hesher doesn’t much care about their problems. Bullying interests him only insofar as it gives him an excuse to set fire to a bully’s sports car. (Which it does.)