I don't get it? I think the artist is trying to convey a sense of anger through the monster, and the bottle that shoots at it represent good, trying to destory anger. Since it is like, swallowing him, it shows the anger destory innocence and fun. Its desire to play football shows it wants to hurt people. The tank that doesn't run on olives shows craziness, and how uselessness, like the Pancreas, usually stops insanity for firing its gun (which is a metaphor for hurting people in this case). Hitler is there as an uncle to show that evil can hide in the form of good. Since uncles are good, and Hitler is evil. And the floating door shows that to escape this place you need wings, which represent clarity and inner peace.

Actually, I was just on drugs. But that sounds nice!

Oh, thank God. And here I thought you needed some serious therapy.

That's what the flying purple monkeys said too.