11) Who is Sheldon's arch-enemy?
12) What is the first thing Sheldon does after waking up every morning?
13) Who did Howard Wolowitz end up marrying in season 5?
14) What does Leonard call Sheldon when he is being annoying?
15) What type of job does Bernadette have?
16) Who designed the website for Leonard and Sheldon's university department?
17) How many times has Penny and Leonard broken up?
18) What type of car did Howard get as a gift from his mother in Season 6?
19) Who is the first character to appear on screen in the pilot episode of The Big Bang Theory?
20) What is the name of the band Raj and Howard formed in the episode "The Lizard-Spock Expansion"?