Answer: Episode title!
Separation can drive people to do wild things and result in shifting a relationship's balance.
In "The Separation Oscillation," Leonard mustered up the courage to confront the woman he kissed while on the North Sea, while Sheldon struggled with his own relationship woes. Still reeling from his breakup with Amy, Sheldon filmed a scathing episode of "Fun With Flags," knowing she'd be watching. Sure, his passive-aggressive approach peeved Amy, but Sheldon went to sleep feeling confident that he could get his girl back.