John rolls his eyes and digs the scanner out of his pocket, approaching Rodney at an amble and waving it until he gets his attention.

"I would prefer to get it back, don't have any spares. What else is on the list? Ianto likes lists."

Lists also keep them on this topic, and stop them meandering on to ones he's trying to avoid. John's a fan of them, and specifically in this instance too.