Sheldon begins playing Words with Friends online with Stephen Hawking, which he interprets as now meaning that he is friends with Stephen Hawking. When Stephen Hawking doesn't continue playing, he becomes concerned that he may have soured their friendship by "spanking him so hard his grad students won't be able to sit down," when Howard explains that Hawking hates to lose or be wrong at anything. When Hawking resumes playing the game, Sheldon finds himself unable to be so intellectually dishonest as to throw the game. When he does lose the game, he gets a gloating call from Hawking.
Meanwhile, Penny tells Leonard that she's enrolled in some college courses. Unable to stop himself, he sneaks a peek at the paper she's working on. Realizing that the paper isn't up to his standards, he writes a new version of the paper, not realizing that Penny actually wants to do the work on her own, regardless of whether or not she ultimately fails the course.
This Episode's Science
Stephen Hawking - Sheldon is quite impressed when he begins playing (and winning) Words with Friends, since Stephen Hawking is one of the legendary physicists of the twentieth (and now twenty-first century), most notably for his work with black holes, specifically in determining the value of their entropy and that they would likely emit Hawking radiation.
Sheldon: Yes. I play the word quiver with a triple letter and a double word score for 72 points. That ought to let the air out of your tyres, Hawking.
Amy: Wow, my boyfriend is friends with Stephen Hawking and my new dandruff shampoo doesn’t smell like tar. Everything really is coming up Amy.
Sheldon: It is glorious. One of the greatest intellects of our time has agreed to engage with me in a gentlemanly battle of wits. And I’m spanking him so hard his grad students won’t be able to sit down.
Amy: You know, when one male dominates another, his testosterone level rises.
Sheldon: What’s your point?
Amy: It’s exciting to think you might be getting a testosterone level.