Terror of Cthulhu Part Deux: The Second Coming
Water. A Cthulhu's natural habitat. When it'd entered this particular dorm, and found himself in comfortable territory, it'd almost fallen back asleep. It was difficult to leave, but eventually, it managed - after leaving a parting gift.
Cam had laid some eggs in the pool.
Luckily, these particular eggs would not hatch into more cthulhu's, but if anyone got near them or touched them in any way, they would explode into green, nasty goop.
And it had laid fourty of them.