In Clu Clu Land, the Unira hid gold ingots in an underwater maze, then tried to stop Bubbles from getting them. In Super Smash Bros. Brawl, if you pick up an Unira and throw it, it will stick to the surface it lands on. Not only do its spines hurt, but it gently pulls in foes who stand near it.. Once it's jabbed someone, Unira retracts its spines and can once again be picked up.
Clu Clu Land (1984)
In Super Smash Bros. for Nintendo 3DS/Wii U
What a cute little creature! You just want to... Oh wait--those spikes aren't just for show! Once thrown or attacked, its spikes extend out and hurt anyone but the character who threw it. Attacking it again can make the spikes retract, so you can even throw it back at the original owner.