...Researchers have documented the first-ever case of a cookiecutter shark attacking a human. Although this shark maxes out at ~22 inches, its scoop-like bite is the stuff of nightmares.  
 
The cookiecutter shark (a.k.a. the cigar shark) may not be the most dangerous shark out there, but its modus is gnarly...  
 
...In 2009, distance swimmer Mike Spalding was attacked off the coast of Hawai'i...
 
 
With links to photograph of injury (ack!) and nature video.