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I don't know, and I'm too lazy to care. Used by people who think pretending to be smart makes them actually smart.
'Why did you fail the test?' 'I don't rightly know. I was too busy thinking about pizza.'
'Where's the car?' 'I don't rightly know. I was too busy staring at the ceiling.'
'Why are you crying?' 'I don't rightly know. I was too busy being an idiot.'