"I have the soulful eyes of a cow."
Why it's apropos: Why, what moooo-velous eyes you have, Mr. Cooper!
Sheldon's big eyes are somehow both brooding and comforting at the same time. Much like a cow, this former child prodigy doesn't seem like a warm, inviting creature on the outside. However, take one long look into those peepers, and you'll see a wise and gentle soul.
"The Mystery Date Observation" (Episode 8, Season 9)