http://www.abc-7.com/clip/10574887/goliath-grouper-pose-problems-for-fisherman-5-pm#at_pco=cfd-1.0

Great video of a giant grouper taking a large shark and also a scuba
divers fin.

We were once anchored in the Dry Tortugas (Ft Jefferson) and a giant
grouper camped out in the shadow of our boat. Every once in a while
he would stick his nose out where we could see him. His mouth was as
big as a pie plate.