This sounds like the premise for the next “Sharknado” rip-off. Kyle King (who’s from Michigan but now living in Japan) was camping when he heard something scratching outside of his tent. So he checked it out, and saw a massive crab holding a knife in its pincers.
He recognized it as HIS knife, and he “bravely” snatched it away. This was a coconut crab, and they can weigh up to nine pounds. The guy was camping on an island off the coast of Japan.
Now we know why Spongebob never messed with Mr Crabs. CLICK HERE to read more about the incident.