Nikolaos Kepesidis was attacked -- or befriended -- by a small octopus in a YouTube video (below) that he posted Oct. 13.
Kepesidis filmed the fierce -- or friendly -- creature attaching itself to his snorkeling mask like a scene from the horror film "Alien," notes RT.com.
The octopus held tight even when Kepesidis rose above the water. The snorkeler was able to pull the tiny sea monster off his face, but then it attached itself to his hand. Once it was removed from Kepesidis' hand, the octopus went for his leg.
Eventually, the octopus realized the folly of his ways and swam off.
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In 2014, an 8-foot octopus wrestled with Warren Murray, who took pictures of the encounter while his diving buddy, David Malvestuto, filmed the incident, noted the New York Daily News at the time (this video also below).
The two men were diving in Bluefish Cove in Carmel, California, when they came across the creature.
The octopus went after Murray's camera, but gave up the fight after Murray took a few pictures using his flash.
Murray, a professional scuba and underwater photography teacher, told the newspaper: "I wasn't too worried. Generally they are not too interested in people. They'll just take off. I was thinking he would take off as soon as I got close to it. When he wasn't moving, I was excited."
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Murray recalled that he started snapping pictures of the beast because his other scuba buddies might not believe his story without proof, an unwritten rule in his scuba diving community.
"I was thinking [about that rule] in the back of my mind," Murray said. "I wanted to capture as many pictures as I could."
Malvestuto added: "I was a little concerned … but we both knew they are harmless. He was very cool and collected. I wanted to make sure nothing bad would happen."
The men may have been lucky. According to National Geographic, the average size of a giant Pacific octopus is 16 feet across and 110 pounds. The largest known one stretched 30 feet across and tipped the scale at more than 600 pounds.