A family enjoying the beach in Panama City, Florida this weekend witnessed a scene right out of a B horror movie: a shark feeding frenzy.

Blake and Tyra Whitlow posted video of the encounter to YouTube, writing that it was the “craziest thing we've ever seen!” The couple was visiting from Huntsville, Alabama, they told local media. At first their four children—who were playing on a raft in the water—were scared by all the splashing from 50 or 60 sharks.

And for good reason, says Frank J. Schwartz, a shark biologist with the University of North Carolina, Chapel Hill.

“Sharks are not going to say ‘oh look, it's a man, I better get out of the way,’” he says. “They're