We don't know what this crab is angry about, but it's clearly very agitated.

The video, taken on June 10, shows a crab lifting up one of its claws and moving it horizontally across its body in a movement that perfectly resembles the cut-throat gesture.

Caroline Inkeroinen was on vacation in Greece when she filmed the clip. She told Newsflare that she started taking a video of some small crabs on a rock she saw while watching the sunset when out of nowhere, a big crab came out and showed her it simply wasn't happy.

"I think he was mad at me for being so close to the small crabs," Inkeroinen told Newsflare. "I'm super lucky for getting it on video. I've laughed at it for days."

I was in Greece on a vacation watching a sunset on a rock by the ocean, when i saw small crabs on the rock. I stared and filmed them when this big crab came out of nowhere and showed me the cut-throath sign. I think he was mad at me for being so close to the small crabs. I’m super lucky for getting it on video, I’ve laughed at this for days.