怪力亂神

Etymology
From the Analects, Book 7 (《論語·述而》):



Idiom

 * 1)  monstrousness, violence, rebellion and supernaturalism
 * 2)  superstition

Usage notes
This idiom was originally to be comprehended character by character, but people nowadays split it by two two-character endocentric phrases, hence the "superstition" meaning.