Judy's answer is great.
Other expressions include:
Did you hit your head?
Did somebody hit you in the head?
Did you forget to take your medication (meds) today?
March 30, 2015
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Were you dropped on your head as a baby is something that would be asked in the UK. HOWEVER, you would only say it to someone you know well as a joke because it's a pretty rude thing to say
March 30, 2015
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What was that? A brain fart?
Put your brain in gear before running your mouth.
March 30, 2015
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I think, "Did you get hit on the head or something?" would be more natural... I don't think this is something we say much though!
March 30, 2015
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A little more common is, "Did someone drop you on your head when you were little?"
March 30, 2015
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