Ah ha, so he is capable of something other than a scowl. Klaus catches it out of the corner of his eye, and someone else might just leave well enough alone with both the innuendo and the implication of it, but ...

"Well, never have I been more sorry to not be an expert. Both hands is the ideal, from what I gather." And then, because he really can't mind his own business, "You...have a lot of pain? Generally?"