answer:To answer your details: I remember from The Hitchhikers Guide To The Galaxy refering to something you can see by not looking directly at it. You have something unexpected (like a flying saucer), and put an SEP field around it (Somebody Elses Problem), and it becomes invisible. Whenever I see something out of the corner of my eye, and turn to see nothing there, I figure it’s protected by an SEP field. To answer your question: Pretty much the entire movie Jacobs Ladder is flashbacks. Very freaky.