You do it all the time without noticing. I do, anyway. Certain ideas or images rise in your mind when you're in mid-flow with pen in hand--or writing finger rigid over keyboard--and believing you have been a lightning rod for heavenly inspiration, you use whatever "you" have come up with and sit back to wait for the plaudits, or the contract from Bloodaxe. And then you remember.
Do it for the mud, spit and cum
in the Thames ~ Bruce Hodder, yesterday.
over the scum & spit & come of quarter century
~Allen Ginsberg, "Memory Gardens", 1969.
Fascinating, as Mr. Spock would say.