Jim Roseman was diving off Florida's east coast when he ran into what looks like a great white shark. Luckily he had a GoPro and his speargun. Around 2:20 he really has to give it a shove.
via the Sun Sentinel:
"He circled me…I had to poke him a few times. He wouldn't go away and then I finally jabbed him hard enough to where he left me long enough i could get to the surface and get out of there."
Glad Florida man made it out alive!