The attack was caught on camera by a group of stunned anglers off the coast of Miami, Florida.
They watched helplessly as the beast took a huge chunk out of the shark they were trying to reel in.
It came as a huge shock to the pals who were trying to catch tarpons, a large fish which inhabit the western Atlantic.
A female angler ended up catching a bull shark instead, the remarkable clip shows.
She was reeling it in when suddenly a much larger shark lurched into view and bit off its entire tail.
Amazingly, the hooked shark continued to thrash about even as other sharks started to circle the bloody water.
"Look at the shark trying to eat that shark," someone is heard yelling on the video.
"Holy s***!" they screamed before adding: "Did you get that on camera?"
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