Spawned inside a lava lake once, underground. I took it as a challenge but there was no way of getting out of there before burning to death.
Sounds like the pre-B1.7 version 404 challenge.hmm... bonus chest won't work on this spawn because of the massive ocean. However if you give yourself a sapling, a wooden pickaxe, and a torch - you can survive and grow by descending into the oil fountain and living in the almost bedrock layer cave inside. You'll need to clear out the dirt by hand and plant the sapling next to the torch - punching off mobs with your hands (or building a wall) to survive long enough for the tree to grow. Eat the apples.
may accept this challenge at a later date
Take a block off one end, put it on the other end, repeat until you're over water.I once had a spawn on top of a floating island, and as cool as that was, there was no way down; the island was too small to give me enough blocks to get down, and there was no water in sight
Take a block off one end, put it on the other end, repeat until you're over water.
Or: destroy the island, then die and it'll have to spawn you elsewhere.