When Wolowitz runs into his ex-girlfriend, Bernadette, we finally learn the reason they broke up: Wolowitz cheated on her with a virtual troll in World of Warcraft.  Why'd he do it?  They weren't having sex because he never put on the move.  Thanks for advice by Katee Sackhoff and George Takei, they get back together.

Meanwhile, tensions run high as Sheldon and Raj continue to work together.  Raj starts an escalating war by buying a desk that's too big for the office.  It eventually ends with explosive results after some chemical warfare.