Kayak fisherman Isaac Brumaghim never saw the shark coming.
It leapt out of the water in predatory mode right beside his 5m kayak as he reeled in a kawakawa tuna in deep waters off Honolulu, Hawaii, last Sunday afternoon.
The predator, possibly a tiger shark, had surged onto the scene to steal the catch from his fishing line.
Mr Brumaghim's stunned reaction, his jittery attempt to save the tuna (before the shark circled around, bumped the kayak and took it anyway) and his shiver of relief as he contemplated what just happened were all captured by his kayak-mounted camera.
"Yeah I did get the shivers a bit ... just thinking about the whole thing and the possibility of me actually putting my hands in after my fish," he told the news station WPTV.
"It made me think how foolish that would have been."
His YouTube clip, titled "Chompy the shark", has had more than 500,000 views since being uploaded yesterday.
Author: Erin Tennant, Approving editor: Emily O'Keefe