"Sorry boss, I'll be about five hours late as I have to work four hours overtime at my other job to cover another employee who's not attending due to a family medical emergency."
yes, I saw it used, and yes it was allowed as a time off without pay.
We have a common one here of - "Sorry, got called in to work most of the night with the volunteer emergency service." This is usually accepted and OK, except when your boss is the volunteer emergency service captain and he KNOWS no volunteers were called out last night - a guy got warned for his BS when he got caught that way.
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