11 Best Lost Twists (super spoilery)

1. That ain't no flashback, that's a flashforward!
2. That ain't Locke, it's a Lockelganger!
3. Desmond crashed the plane!
4. That ain't Henry Gale, it's Ben Linus!
5. There's a polar bear!
6. There's a monster made of smoke!
7. That ain't Penny's boat, it's Whitmore's!
8. That ain't a fellow oceanic passenger, it's an Other!
9. The island is under water!
10. That ain't christian shephard or Locke, that's the Smoke Monster!
11. We ain't taken the plane, we're taking the sub!

Forgot to mention...

There is a hatch! A light just turned on!

and

There is a statue! And it only has four toes!