What shock? This was a comedy!

The most disturbing thing in this movie was how *beep* that son was treating his mother. I'm assuming visitor Q was the dude in the red shirt?

He was the best thing to happen to that family and proved that sometimes all people need is a right smack upside the head to get them back on track.

Once he got the mom's juices going, all that positive energy just spread.
She had the confidence to stand up to the son.
She didnt care about the infidelity of the husband, and was in fact happy to help him out of his bathtub problem.
This in turn made the husband see his wife in a new light and came to love her again.
With his new 'freedom' (and heroin) him and the wife both take out the bullies for the son.
Who then, now free from that burden and seeing his parents in a new light, thanks the Visitor and can now go back to his studies.

You dont really take all those over-the-top taboos seriously do you? There's nothing but comedy written into each one of them.
At least that's how I took it (Just like Ichi the Killer)

Aside from that, this movie was hilarious to me:
"Early Bird"
"Stop saying that!!"

"Come on say something"
*camera drops and all you hear is the sound of feet running*

The split screen of Visitor and Husband eating dinner only to find out it's in the same house, only minutes after his 2nd rock to the head.

When he's filing the fireworks assualt - This is my son, this is my wife, this is..I'm not actually affiliated with this man.

The LAKE of milk when Visitor asks for garbage bags (ewww, but lol)
Total comedy imo