One Irishman, in particular, seems madder than most. Described by the Belfast Telegraph as being "an even angrier version of Father Jack Hackett" (which the photos do appear to confirm), legendary Irish rugby pundit George Hook apparently spent much of Saturday's game raving about O'Sullivan's inadequacies.
"That's absolutely horse manure," he said on RTE's coverage of the Ireland v Italy match, responding to the somewhat mischevious suggestion that Conservative Eddie was Ireland's best ever coach. "I don't care if we beat Georgia, Namibia or Besotaland, I want us to do well in World Cups and Six Nations."
Hook then went on to make the obvious connection bewteen the Ireland coach and erstwhile German dictator Adolf Hitler...
"He has retreated into the Fuhrer bunker. If Eddie was in Berlin in 1945, they'd still be fighting.
"He just retreats and won't give in, he's playing with imaginary Panzer division."