Just finished watching Sherlock, Series 3, Episode 2, The Last Vow, on PBS. While planning the wedding reception for John and Mary, Sherlock pulls out two folded serviette options. John choses the Opera House over a swan. When asked how he knows how to do this, Sherlock tries to go on about how he learned them, and then admits to You Tube. Maybe this one, http://www.youtube.com/watch?v=aTs5D8w3GjE
Then we see Sherlock sitting among many folded Opera Houses. Kathy Knapp, Peoria, Illinois, USA Do well your part today. - Juliette Gordon Low