The Big Bang Theory S01E17
Duration: 3:00 min.
Created by: Chuck Lorre & Bill Prady
Leonard's attempt to arrange a date with Penny results in both Penny and Leonard's seeking Sheldon's advice. Sheldon advises Penny that "just like Schrödinger's cat being alive and dead at the same time", her date with Leonard currently has both "good and bad" probabilistic outcomes. The only way to find out is to "open the box", in other words collapse the wave-function of an uncertain date into a specific outcome.