The Grindylow they crawl,
The Grindylow they creep,
The Grindylow come to sneak ashore and kill you in your sleep!

The Grindylow look fat,
The Grindylow look thin,
The Grindylow are both these things and everything inbetw’in!

The Grindylow bite fish,
The Grindylow bite meat,
The Grindylow hide under your bed and take your eyes to eat!

The Grindylow they snarl,
The Grindylow they snap,
The Grindylow take your soul to hell and never bring it back!

(many thanks to China Mieville for inventing the Grindylow)