Pareidolia is the psychological phenomenon where people think they see some significant pattern or image in something random.  This may be the face of Elvis in pork chop grease or the face of the Virgin Mary in a once-bitten sandwich.  I have a coaster on my desk and an almost unempty glass of ice water, which is sweating profusely.  When I lifted the glass, I was surprised to see a little pareidolia of the smiley variety.  Incidentally, the 26th birthday of the smiley was just a week or so ago.

Smiley pareidolia on a coaster, left behind by a sweating glass of ice water

Smiley pareidolia on a coaster, left behind by a sweating glass of ice water