Watch this video of a crab surfing on a sea cucumber

As the Monterey Bay Aquarium Research Institute (MBARI) explained:

This sea pig (Scotoplanes sp.) was spotted at 1,290 meters (4,230 feet) beneath the sea surface with a juvenile king crab (Neolithodes diomedeae) clinging to its body. Researchers speculate that this may help young crabs evade predators.