Apparently they ate Amelia Earhart. Also, they like to steal pots from humans and wear them as armour. Here's a baby one:
Here's a not-baby one:
Here's a pretty one:
I used to be horrified by coconut crabs but now I just think they're awesome. They're really scary and I'd never want to meet one but they're awesome in theory.
So: Coconut crabs: Natures Worst or Most Awesome Thing?