In Season 4 of The Big Bang Theory , the plot centers on the burgeoning relationship between Sheldon and Amy, as well as Leonard's romance with Raj's sister, Priya.
: In episode 6, Sheldon is shown playing the classic 1980s text-adventure game Zork using an emulator. The Big Bang Theory - Season 4
: When Howard claims he wouldn't sleep with Raj's sister out of respect, Leonard reminds him of the time Howard dropped Raj's iPhone in a urinal. In Season 4 of The Big Bang Theory
: "I could never bring a white boy home to my parents. They'd have a cow—which is a much bigger deal in India". : "I could never bring a white boy home to my parents
: Sheldon and Amy text daily but Sheldon initially refuses to call her his girlfriend, leading the group to coin the name "Shamy".
The following are notable text-based quotes and highlights from the fourth season: