I feel a "Which Hand" would work well.

WulfieSmith

I'll always remember when Wife and I were doing an Illusion Show for a Large Deaf Group - in the Middle of the Show someone shouted "STOP TALKING - WE CAN'T HEAR YOU", someone else shouted "His assistant isn't deaf and needs the cues" - the Audience all applauded and almost threw the 1st guy out (there was a signing interpreter on the side of the stage). Don't we all have fun ?