“Shouldn’t I know about these things?” I said. “The list of things you need to know about, Peter, is extraordinarily long,” said Nightingale. - Ben Aaronovitch

I wasn’t ready to believe in ghosts, but that’s the thing about empirical experience: it’s the real thing.

“Of course now I realize it was a telepathic compulsion.”
I was afraid to ask from who—but I had to know.
“From aliens,” she told me.
“Aliens?”
“I’m not mad, you know,” she said. “I’ve been sectioned. They put me in for four weeks’ ‘evaluation’ and at the end the top shrink calls me into her office and looks me in the eye and says, ‘you’re saner than I am—go away.’”
“Did you tell them about the aliens?” I asked.
“I may have glossed over some of the details,” she said.

Anyone who’s taken statements from multiple witnesses to the same event will know how malleable memory is.