I was just thinking about a finale for the last season.
Sam and Dean beat the latest evil thing in front of them, and save the world again. Dean dies in the clash, and before dying, he has a flashback of all the good and bad times he had in his life. (His father dying, Sammy dying more than once, Hell, Purgatory, Angels, Demons, everything. He thanks Sammy for everything and his soul ascends to Heaven before Sam.
The screen zooms out to the Earth from distance, then the galaxy, then Dean's eyes. The final scene shows us Dean Winchester in a mental hospital. He's been there all his life getting visits from his Mom, Dad, Sam, Lisa, Castiel, Bobby with the medical assistants Azazel, Crowley, Lilith, Lucifer, Meg and others looking after him every day.
Of course it's a shit ending to a great series, but it could describe just how complex the mind of a human being can get.