Threatened, this animal shoots its own guts out through its rear end

Some sea cucumbers defend themselves by violently expelling sticky internal threads called Cuvierian tubules through their anus, sometimes along with parts of their own digestive tract. The threads expand up to 20 times their original length in seawater and can entangle a predator within seconds, while the sea cucumber crawls away to regrow what it lost.

— Wikipedia contributors, Cuvierian tubules — Named after Georges Cuvier