Needs a Better Title
. Up for Grabs
This appears predominantly in Platform Games
. It's a creature that looks perfectly cute and innocuous while your character on-screen is facing it. Possibly it even looks like a rock or other terrain feature as camouflage.
Then, if you turn your back on it, it'll move forward and attack you when it gets close enough - unless you turn back to face it, in which case it goes back to looking innocent.