The opposite of improbability. It is caused by the lack of improbability that emanates from newbies, and threatens to collide with improbability and destroy the island.1)2)3))

1)
For this reason, contestants like The Jerkymaster kill newbies
2)
Others like to fix this by speeding up their exposure to improbability.
3)
It is widely blamed for certain individuals being forced to leave the island.