B757 enroute to Teneriffe - At the end of a long stream of flight deck visits a young version of Forest Gump stumbled in. In silence he looked around the F/D and his eyes settled on the rear bulkhead.
"Have you any questions?" I asked politely.
Instead of asking one of the most common questions: "Do you know what all the knobs and dials are for?" he replied: "Yeh, is that your 'at?"