I was thinking of a tired student attending a history class after lunch. The student’s attention drifts and his eyelids start drooping and his head falls forward to be jerked back up as if to say “No, no. I wasn’t sleeping.” Someone asks the student a question and he confidently but sleepily answers “1066”. 

Which would have been fine if they were talking about William the Conqueror and not the American civil war.

This has never happened to me.