Sharks like to eat seals. Everyone knows that.

NPR has a story about some shark researchers in South Africa, who lure sharks to strike simply by floating surfboards on the water.
"To a shark, apparently, a nice little six-foot swallowtail does a near-perfect imitation of a seal. When retrieved, the decoys were often missing hubcap-sized chunks from their sides"
Correction: sharks like to eat things shaped like seals.
Here’s a site dedicated to "all things sharky…and other aquatic antics."
gulp.