fanf

A common misspelling of FNAF.

Guy 1: Fanf is so cool!
Guy 2: DUDE IT'S SPELT FNAF!!!

Prussian blue

A dark blue pigment that is made of oxidized ferrocyanide salt.
Known for its use in paintings, and was used to color the Prussian uniform until World War 1.
Named after prussic acid.

Person 1: Did you know that Big Ben's dials were Prussian Blue before the 1930s?
Person 2: You serious, bro?