After a maddening day at the day job, in the middle of class a writing thunder bolt from the blue. One of my classmates works in hospice. She told the story of one old man who had a "I see dead people" t-shirt. He wore it everywhere, she said. Around the hospice, to dinner, and even to mass.
That t-shirt would oh so work in the next novel. And I know exactly where it is and how it fits in. This is why as a writer you need to get out and interact with other people gaining experiences.
Yes, I told her that story was soooo going to be in my next novel.