Pareidolia is a psychological phenomenon involving a vague and random stimulus (often an image or sound) being perceived as significant. 

Common examples include seeing images of animals or faces in clouds, the man in the moon or the Moon rabbit, and hearing hidden messages on records when played in reverse.

This plastic milk container appears to have a face and looks annoyed. image: imgur

The word comes from the Greek words para (παρά, "beside, alongside, instead") in this context meaning something faulty, wrong, instead of; and the noun eidōlon (εἴδωλον "image, form, shape") the diminutive of eidos. Pareidolia is a type of apophenia, seeing patterns in random data.

A video explanation of this phenomena including why and how it is hard wired into our brains. source: Vox - Youtube

source adapted from: Pareidolia. (2014, September 19). In Wikipedia, The Free Encyclopedia. Retrieved 06:13, September 22, 2014, from