Sheldon: Uh-oh. That's the fourth time she's been to the bathroom in the last two hours.
Amy: So?
Sheldon: Her breakfast was binding. I made sure of that.
Amy: So?
Sheldon: So she clearly has some sort of stomach distress. If it's viral, we're all susceptible.
Amy: She's probably just airsick.
Sheldon: Yeah, but what if she's not? What if we get what she has? What if we infect the King of Sweden? That's how wars start. [Penny leaves the bathroom and instantly heads back] All right, that's it, this is Outbreak and she's the monkey.
Amy: [faintly] Wait. Stop. Be reasonable.