There's this animal called a Sea Cucumber. You may have heard of it. You may want to go read its node.

The sea cucumber is possibly the most.. advanced member of the echinoderm family, which also includes the starfish and a few other animals. The one main defining characteristic of this family is the ability to regenerate practically anything that's lost; i.e. you cut an arm and a chunk of the center off the starfish, and the starfish grows a new arm, and the arm grows a new starfish.

Well, this nifty genetic ability lets the Sea Cucumber do something that as far as i'm aware is totally unique.

Sea cucumbers can at any arbitrary moment expunge all their internal organs as a defense mechanism

Yup. Startle a Sea Cucumber and its reaction is to spew out all of its internal organs at whatever appears to be startling it. I guess this is in order to give it time to get away, or whatever. Sounds like a rather stupid ability, but i guess it must be effective, because the species seems to be surviving rather well.