I'm a Shark

The creator of Dinosaur vs. Bedtime is back with a brand-new story. A boastful shark is not afraid of anything, which impresses his underwater friends until they ask about spiders.

Shark's not afraid of anything.
The dark?
Nah.
A big mean bear?
Don't make him laugh!
But there is one thing that even Shark fears. . . . Can you guess what it is?