One of them got the whole thing on tape.
The huge shark, estimated at 16-and-a-half feet, repeatedly circled and lunged at the small fishing boat.
In short order, the fishermen decided they'd seen enough.
"It almost took the motor off," one said.
"I was pretty quick to jump on the throttle and get on outta there," said another.
When they reached shore and inspected the boat's engine, they found -- shark teeth embedded in the propeller.
To see the video of Jeff Glor's report on the scare, click below: