I didnt think much of it at the time, CeeLo tells EW.
This is not to devalue it I just didnt know.
Considering the songs success, that might seem, ahem, crazy.

Credit: Barry Brecheisen/WireImage
But the singer has a point.
Those relatively humble roots defined the week of Atlanta sessions that produced Crazy andSt.
Theyre very simple songs the way that they were done, CeeLo says.
They arent pretentious at all.
Crazy was just another of the batch.
That immersive experience soundtracked the conversation that led to the songs iconic lyrics.
We talked about rock stars and authenticity, CeeLo says.
We were talking about the Ozzy Osbournes, the Iggy Pops of the world, the Jim Morrisons.
We reveled in those individuals, those icons.
All that we could really guarantee [was] that it had a ring to it.
Those four pulses that kick off the song?
Danger Mouse initially added them as cues so CeeLo would know where to start singing.
I just needed that so I could count myself in, he says with a laugh.
We ended up just leaving it like that.
Crazy never hit No.
I still enjoy it, he says.
Im still in awe of it.