What is the most aggressive fish that you know?

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Cookie-cutters are a pain in the bum even if you are nowhere near their nest. Your just swimmin along and gnash!! Completely out the blue. Nude dangling anyone? Definitely wouldn't go near their nest. Nobody has reported on their nesting habits as nobody has got outta there alive.
 
what is the most of aggressive species of fish that you know of?

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Worst I've had was a couple year old black shark.
Probably not near the top of the overall ranking, but killed like 5-6 mature severums and a polypterus before I gave up on him and rehomed him.
Still one of my favorite looking fish though...
 
Salminus brasiliensis.
 
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