There have been a lot of funny posts about Walt's dog, Vincent. But in rewatching the pilot, I noticed that we see Vincent silently observing the Oceanic 815 survivors, as they travel to the find the cockpit. Then, the smoke monster suddenly shows up.
Same thing happens the first time we see Vincent, just after the crash. Soon after he spots Jack and the rest, the smoke monster shows up.
Could it be that Vincent died in the crash and is being embodied by one of the island 'gods' or the smoke monster to keep an eye on things?