The Lizard-Spock Expansion - S2-E8
Sheldon: What happened?
Leonard: Howard's at the Mars Rover lab. He says he's in trouble. Defcon 5.
Sheldon: Defcon 5? Well, there's no need to rush.
Leonard: What?
Sheldon: Defcon 5 means no danger. Defcon 1 is a crisis.
Leonard: How can 5 not be worse than 1?
Raj: Yeah, Star Trek V, worse than I.
Sheldon: Okay, first of all, that's a comparison of quality, not intensity. Secondly, Star Trek I is orders-of-magnitude worse than Star Trek V.
Raj: Are you joking? Star Trek V is the standard against which all badness is measured.
Sheldon: No, no, no. Star Trek V has specific failures in writing and direction, while Star Trek I fails across the board, art direction, costuming, music, sound editing.
Leonard: Can we just forget I said Defcon and go?
Raj: Star Trek V!
Sheldon: All right, will you at least stipulate that Star Trek IV: The Voyage Home is in-arguably the best?
Raj: I have three words for you. Wrath of Khan.
The Lizard-Spock Expansion - S2-E8
Sheldon: I'm sorry, but I'm not going to watch the Clone Wars TV series until I've seen the Clone Wars movie. I prefer to let George Lucas disappoint me in the order he intended.
The Lizard-Spock Expansion - S2-E8
Howard Wolowitz: If it's "creepy" to use the Internet, military satellites, and robot aircraft to find a house full of gorgeous young models so I can drop in on them unexpected, then FINE, I'm "creepy."
The Lizard-Spock Expansion - S2-E8
Raj: I'll tell you what, how about we go rock-paper-scissors?
Sheldon: Ooh, I don't think so. No, anecdotal evidence suggests that in the game of rock-paper-scissors, players familiar with each other will tie 75 to 80% of the time due to the limited number of outcomes. I suggest rock-paper-scissors-lizard-Spock.
Raj: What?
Sheldon: It's very simple. Look, scissors cuts paper. Paper covers rock. Rock crushes lizard. Lizard poisons Spock. Spock smashes scissors. Scissors decapitates lizard. Lizard eats paper. Paper disproves Spock. Spock vaporizes rock. And as it always has, rock crushes scissors.
The Lizard-Spock Expansion - S2-E8
Wolowitz: I got the Mars rover stuck in a ditch.
Sheldon Cooper: Where?
Wolowitz: On a dusty highway just outside of Bakersfield. Where do you think? On Mars!
Answer: Because Raj's selective mutism seems to be caused by women that Raj sees (on some sort of conscious or subconscious level) as a potential sexual partner. An attribute that wouldn't apply to either his sister or mother.