My scariest in-flight experience happened 6 years ago. I was booked in the middle coach seat on a 747 by my former travel agent. Turns out that a VERY obese couple were my bookends. Both fell asleep...on me. Seriously, two heads - one on each of my shoulders - when I woke up from my nap. The FA walked by a few moments later and started laughing. The flight lasted 4 1/2 more hours.