The Gongoozler

The Gongoozler is a mythical creature, resembling a merman wearing goggles. It is said to stalk the depths of swimming pools, dragging people down to the depths by their toes when the victim goes swimming during the nighttime.

"Bro, I think there's something in my pool, I can see a shadow."
"It's the Gongoozler! Don't go in!"