If you've ever wondered(and who hasn't?) what a Neutral Safety Switch looks like on the inside, here's an example from my wife's 2005 F150 5.4. I replaced it because of a couple of times when she was out and the truck wouldn't start in Park, only in Neutral. This is my all-time least favorite type of problem - highly intermittent with nothing to test so you can't even assume it's ok until it doesn't happen for a couple of months.