I fell out of the map after I was knockbacked by one of the Zombies attack and fell through the bridge in the middle. Happens at least twice an hour.
Happened to me at one of the Evil Eyes map as well as the Orbis Tower map, when you could descend at certain parts of the platforms and fall into the ground (Into the very bottom of all of the platforms- and disappear!).
You used to be able to do this on gms in the amoria town map as well when it was first released, you could teleport down under the bridge on the bottom and then walk into the abyss .