Leonard: I grew up in a house full of crazy academics. Instead of leaving Santa milk and cookies, we had to leave him a research paper. And in the morning, you could tell he'd been there because the paper would be graded.
Sheldon: No wonder you love Christmas. That sounds amazing.
Leonard: It wasn't amazing. I got a C- four years in a row.
Sheldon: Yeah, I'm familiar with your work. C-minus was your gift.