Actually, a couple of coworkers were discussing thier various theories on Lost, and I seemed to have formed one of my own. Now keep in mind I haven't watch all that much of the show, so this is just kind of a shot in the dark...
The island, somehow, allows people to manifest things with thier minds. The polar bear. Walt appears all wet and then disappears. The bunker. Desmond in the bunker. All things people could have been thinking about, and thus, they appear on the island.
The numbers. Ok, so the big fat guy thinks these numbers are cursed, so the numbers begin appearing on the island. It may seem like a conspiracy or fate or something, when in reality, they are simply there because he is thinking about them.
But, again, as I've said, I haven't watched it all that much, so I may be missing something.