Just remembered another one. Our client (a "network administrator") has an admin section for his business:
Client - "Will this have a submit button on it when it's done?"
Me - "It has three submit buttons"
Client - <blank stare over the phone>
Me - "The one that says 'add new item' adds a new item, 'delete item' deletes an item, and 'edit item' edits the item."
Client - <processing this amazing revelation... and failing> "I guess you'll just have to show me next time I come in."