[s2e17] The Terminator Decoupling -

In a highlight of the season, Penny loses patience with Sheldon’s complex instructions and simply smashes his puzzle box to get the drive.

Raj manages to talk to her after drinking what he thinks is beer, only to lose his "magic" when Howard reveals it is non-alcoholic. [S2E17] The Terminator Decoupling

Sheldon must guide Penny into his "sanctum sanctorum" (his bedroom) via phone. In a highlight of the season, Penny loses

Sheldon simply loves trains, even if it means dragging the group through a 7-hour odyssey to meet Nobel laureate George Smoot. 2. The "Summer" Variable In a highlight of the season

Sheldon insists on taking the train rather than flying.