"Based on a True Story" is generally a pretty dubious claim for a movie to make. Hollywood is notorious for taking things that actually happened and throwing in enough flashy stupidity to keep the lowest common denominator distracted from how overpriced movie tickets are.
10. Ilsa: She Wolf of the SS Isn't Just Nonsense 9. The Hunt for Red October Is Actually Based on a Much Cooler Story 8. Final Destination Based Its Opening Scene on a Real Plane Crash 7. 50 First Dates Is (Coincidentally) A True Story 6. Men Behind the Sun Will Haunt Your Nightmares 5 AND 4: Texas Chainsaw Massacre and Psycho Are Both Based on the Same Serial Killer 3. Rocky's Real Name is Way More Badass 2. Jaws is a True Story, But Not The Way You Think 1. To Hell and Back Just Straight Up Happened