No idea what the cocaine/coabaine reference is about. Must be a Seattle thing.
Curt Cobain was a rock star - killed himself with a gun many (20???) years ago.
There is another butterfly with images of the former Mayor of Seattle (Ed Murry, liberal gay guy and child molestor), some local pastor, and another local guy. Who knows what it all means? But - I guess that is probably the entire point of this promotion - to get the locals talking about it.