Sheldon Cooper: To a hospital? Full of sick people? Oh, I don't think so.
Penny: Okay, well, your friend and his mother are there. We're going!
Sheldon Cooper: I can't.
Penny: Oh, don't tell me you're afraid of germs.
Sheldon Cooper: Not all germs. Just the ones that will kill me. The same way I'm not afraid of all steak knives; just the ones that might be plunged in my thorax.
Leonard Hofstadter: Ah-uh, fine, I'll tell Howard you didn't come because you're more concerned about your own well-being than his.
Sheldon Cooper: I would think he would know that.
Penny: Okay, you know what? You are unbelievable. You buy all these superhero T-shirts but when it's time for you to step up and do the right thing, you just hide in the laundry room.
Sheldon Cooper: Fine, I'll go. Just for the record, my Aunt Ruth died in a hospital. She went in to visit my Uncle Roger, caught something, and bit the dust a week later. The two of them now share a coffee can on my mother's mantel.