The goblin shark in the YouTube still shot above was found in Australia in January and was donated to the Australian Museum of Sydney. In the video (which can be accessed by clicking on the YouTube link above) Mark McGrouther, the Collection Manager at the museum, shows off the dead specimen, allowing for a close-up view and explanation of its unusual jaw structure, nose and teeth.
To see a video of a live goblin shark biting in the manner explained above, visit this earlier Neatorama post for that fascinating footage.
(Yes, I just quoted the worst song Frank Zappa ever recorded, deal therewith. I'd work in a mud shark reference if I could figure out how.)