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When you get dragged out of your cozy bed and tossed into a place where you have to be productive, and you feel like you're about to lose your mind.
I got a case of the Mondays when my boss yelled at me for not bringing coffee to the meeting.
My sister said she had a case of the Mondays because her cat decided to eat her laptop.
I told my friend he had a case of the Mondays because he showed up to work in pajamas and cried.