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When someone is so clueless they sound like they just woke up from a coma and got hit by a truck.
'I have no idea what you're talking about' said the guy who stole your lunch and your dignity.
'I have no idea what you're talking about' said the kid who missed the whole class and the final exam.
'I have no idea what you're talking about' said the guy who signed the lease and then vanished.