The fact that Valve
(Game creators) can't count to three but can to 4,5,6 etc. popularized by the fact that the third Half-Life game wasn't Half-Life 3 but Half-Life 2:Episode 1
John:Hey! Can't wait till Portal 3 comes out!
Jack:Umm... Valve can't count to three, idiot.
John: Oh! Then let's wait for Portal 2: The Sequel.