[BTirish]

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Why does Michael hate Toby so much? I can't think of an incident that would cause Michael to hate Toby in every way.

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Seriously? Toby is the rules guy and has shot down a lot of Michael's crazy ideas and is seen as a killjoy.

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Yeah I think it starts in the casino night episode. Michael wants to have fireeaters or something and boyscouts and Toby won't let him. Then it becomes a running joke.

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There are definitely indications before that that Michael doesn't like Toby. It's just one of the gags associated with an office: management doesn't like HR. The line in Casino Night is definitely an awesome highpoint of this running gag, though.