2♦ was a weak two (typically sound opponent on your left, so despite the fact that he was in 1st seat favorable you're fully expecting a 6 card suit) and partner failed to alert your 2NT bid, which you have agreed to play as lebensohl. Before you have the opportunity to tell the opponents that your partner has failed to alert, your RHO (South) starts motioning towards the 2NT bid. As soon as you can you tell the opponents that your partner has failed to alert, at which point your partner apologizes and says he forgets lebensohl over weak twos about once a month (not sure if he was kidding).
If one believes UI has been transmitted by South (the person who motioned towards the 2NT bid) in this situation, when should the director be called?
Plus... it's free!