sometimes bad movies do good things

Deep Blue Sea is a fairly typical (although refreshingly self-aware) example of the 'superintelligent genetically modified shark wreaks bloody vengeance on the scientists who created it, destroying their high-tech undersea lab and instigating a Poseidon-Adventure-style escape sequence' genre, but it has quite a few good moments, including Samuel L. Jackson, eaten mid-soliloquy by a shark.

the truly great moment, however, comes at the end.

( spoilers ahoy: )