Captain Incest came into being in a topic entitled "My sister saw me fapping", created by RX7InfinitiIII, on January 13, 2006.
It started when Cokes311 posted "P"!. Repus_Yortsed, Wedge Antilles, Tweeeked, TheRock1525, and Explicit Content followed with I! H! B! (Pee In Her Butt), then "By Your Powers Combined..." and finally "I AM CAPTAIN INCEST!". This was completely and entirely unplanned, and fortunately, a screenshot of the event was saved.