On last Thursday's The Big Bang Theory, Sheldon's girlfriend Amy suggested that they dress up as a couple for Halloween. Sheldon immediately suggested the duo of R2-D2 and C-3PO, to which Amy turned down. She had other ideas, like Romeo & Juliet or Raggedy Ann & Andy.
Needless to say Sheldon was not impressed. He made a ven diagram to show which costumes he preferred versus which costumes Amy preferred (you can see he was sticking to various pop-culture favorites including Kirk/Spock, Batman/Robin, Jobs/Wozniak, Ford Prefect/Arthur Dent & The Doctor/Dalek!)
They finally reached a compromise, with Amy going as Raggedy Ann and Sheldon (losing) and going as Raggedy C-3PO. You can see a couple screenshots from the episode above. You can watch the episode for a few more days at CBS.com.