Use of Unauthorized Information from Your Partner!
Law 16: ANY extraneous information from partner that MIGHT suggest a bid or play is UNAUTHORIZED. This include remarks, questions, unmistakable hesitation, tone, gesture, movement or mannerism. A player may NOT choose a bid, pass, or play that is suggested by partner's behavior.
When a player thinks an opponent has made information available in a manner noted above, he may announce that he reserves the right to call the Director later or may summon the Director immediately.