What's your worst imaginable scenario and why?

Well the thought occurred to me after watching the movie " 50 First Dates." If i were to wake up one morning in lets say 50 years, on my death bed, and not having a single memory of the 50 year gap from now to then, it would probably be one of the worst imaginable experiences for me. I would burst out in tears on the spot. I just really value my life.