This sometimes happens when you are a seal in northern California: (note large teeth gashes in seal's rear end)
Photo by Benji, June 26th 2009. I encourage you to educate yourself and your friends about how fragile and important sharks are. Sharks have been in the oceans for hundreds of millions of years - since before dinosaurs - but they might not survive human pressures on them from global warming, pollution, shark finning, by-catch fishing, and other environmental problems.
P.S. - today marks the third year of my blog! Thanks to Save The Waves, Proplaya, and The Ocean for all the awesome support. And thanks to you for reading. I love you.