grindy

It's hard to define crazy, so let's not even try it.
Crazy is not necessarily strange or avantgarde.
It's a feeling.
The song might be from any genre or no genre at all.
It might be crazy in a humorous or scary way, or both.
It might have just one crazy element (vocals, weird guitars...) or be made of 100% crazy.
But just one song. I know it's hard to choose.

I specialize in the weird stuff, so the one-song-rule is especially difficult for me, but I think I'll go with this one, although something much more crazy might pop into my head any time, making me regret this choice.

__________________
A smell of petroleum prevails throughout.