Wedding anniversary years have well-established connections now common to most nations: 5th Wood, 10th Tin, 15th Crystal, 20th China, 25th Silver, 30th Pearl, 35th Jade, 40th Ruby, 45th Sapphire, 50th Gold, 60th Diamond, and 70th Platinum. In English speaking countries the first, wooden, gift was cut on the day of celebration and then presented to the wife as a finished article before the next two quarter days had passed. The modern tradition may have originated in medieval Germany where, if a married couple lived to celebrate the 25th anniversary of their wedding, the wife was presented by her friends and neighbours with
What Is and What Should Never Be (Supernatural) deceased girlfriend—but she was busy filming for the Texas-based television series "Friday Night Lights". Because Jessica was an integral aspect of the storyline, the production schedule was adjusted to accommodate the actress. The first five days of filming commenced for "What Is and What Should Never Be", and production then shifted to "All Hell Breaks Loose, Part One" until Palicki became available for the final three days of filming. However, she was not present for filming of the episode's climax. Instead, the actress filmed her part in front of a blue screen, and was later digitally added into the scene.