This is a French inside joke that references a common English teaching manual used in France in the 1970s and 1980s.

The "Where is Brian" joke originates from famous comedian, Gad Elmaleh who recalls being traumatized learning English in school while young. He says "You didn’t know who Brian was, you didn’t care, but you had to find out where he was in the house in order to learn English, that was it."

The correct response is "Brian is in the kitchen." Try it with your French friends!
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