This amazing hat was posted on craftster.org. It looks like the shark leaped out of the water and attacked the boy. The teeth are made of fleece.
I made this hat for my son - he wanted a mean shark. I saw the dead fish hat pattern and loved the idea - I just varied the pattern quite a lot to make different looking species. And felted it so it looks like it jumped out of the water and landed on his head...
I basically cast 90 stitches onto a size 9 circular needle and winged it from there. I used Patons wool and it felted great.