I'm not schizophrenic so I can only answer for one of me, But I actually try to shut off my thoughts and see what weird/cool stuff I can come up with on guitar and bass, or I write stupid black comedy, that reads out like a sarcastic and gory "Hitchhiker's Guide".
For those that dont know: Black Comedy=Dark, dark comedy. Nothing involving ghettos, minus the one I wrote that had a newscast about the most recent Amish shooting of a gang neighborhood...