Enypniastes eximia, a sea cucumber known as the deep sea Spanish dancer, “uses a unusual defense mechanism: when attacked, its grainy skin lights up and detaches, sticking to the aggressor. Finding its face plastered with a sticky, bioluminescent mask that it cannot shake off, the would-be predator becomes the vulnerable prey.” 

Image and text from The Deep: The Extraordinary Creatures of the Abyss by Claire Nouvian.