Aha! The magic doorknob! A simple, usable submission. But, just like an urban legend, this badboy has hundreds of versions and variations. Doorknobs chewing off fingers, cursing, screaming an alarm, telling riddles etc.
Still though; a nice little writeup.
Originally I was a little disappointed. But reading through the comments amused me :)
2.5/5 for the original
+0.5/5 for the comments
= 3.0/5
Dungeons (Underground) (Traps)