A few years ago I was out deep-sea fishing with a buddy.  We caught
nothing, but we were trailed by a hammerhead shark for several miles. 
The thing was longer than the boat was wide.  Scary.  Where were the
dolphins then?

This video, uploaded by BlueVoiceOrg on November 9, 2011 shows that dolphins are a good friend to have around when a shark shows up:

While I'm not sure if the dolphins were protecting the narrator or simply trying to keep the hammerhead away from their pod, they did effectively run the shark off.

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