It’s disturbed some marine animal that was resting, and now we’ll probably be attacked along the way!”
From JRR Tolkien's "The Lord of the Rings":
The stone vanished with a soft slap; but at the same instant there was a swish and a bubble. Great rippling rings formed on the surface out beyond where the stone had fallen, and they moved slowly towards the foot of the cliff. ‘Why did you do that, Boromir?’ said Frodo. ‘I hate this place, too, and I am afraid. I don’t know of what: not of wolves, or the dark behind the doors, but of something else. I am afraid of the pool. Don’t disturb it!’
