Future Lost Spoilers

Desmond starts having daily "visions" of Kate going to the bathroom.

Claire's baby is Jack's father.

Juliette manages to impregnate Sawyer, fulfilling his most precious and secret wish.

Hurley opens a beachfront fried boar joint, only to lose it in a freak tidal wave/meteor shower/monster truck accident.

Locke accidentally destroys the second island when he pushes the button labeled "SELF DESTRUCT DO NOT PUSH DANGER DANGER DANGER!!!" just to see what would happen.

The Smoke Monster is really just a playful pup that doesn't know its own strength. After patient obedience training it soon becomes a beloved member of the group.

Charlie gets eaten by a half-man half-shark. The half-man part is Jack's father. (Thanks JB!)

Jack reveals that his true plan all along was just to get Kate and Juliette into a threesome.

The Others turn out to be nothing more than an elaborate network of agents formed to sell timeshares.

Michael and Walt return guns blazing with the fighting men and women of the 105th, under the command of Jack's father.

Ben is actually little Timmy Jenkins, age 8. The whole series turns out to be in Timmy's imagination as he plays in the back yard.