By LARRY CALLOWAY  (Originally posted Sept. 9, 2012) Knock. Knock. Who’s there? Argo. Argo who? Argo Fuckyerself. This punch line — the line, not the whole joke — is a running gag in Ben Affleck’s “Argo,”  based on the rescue of six Americans who hid in the Canadian embassy during the 1979 Iranian hostage crisis. […]