Not counting things that could easily be perceptual glitches or false memories (those are fun), only once. I had a sudden premonition, based on nothing, that so

Not counting things that could easily be perceptual glitches or false memories (those are fun), only once. I had a sudden premonition, based on nothing, that something really bad had happened to my best friend. It was so strong I spent the next day in a panic trying to determine if she was ok. This was very uncharacteristic of me and it was just all consuming. I then got a call from a friend of a friend that she'd been in a car accident, died, been resuscitated, and was in a coma. (She's ok now.) The only explanation I can think of is a coincidence between my having an unprompted fit of delusional paranoia, and her having a car accident at the same time. She is a generally disaster-prone person, but I don't normally worry about it, and that's the worst thing that ever happened to her. There are people who can verify that I was in fact out of my mind and flipping out before anybody knew anything had happened.