"When you mess with the bull, you get the horns. I'm about to show this guy how horny I can be."
Why it's apropos: Much like a bull, Sheldon has been known to have a short fuse, especially when it comes to defending his honor. Here's a small piece of advice: If you don't want to find yourself up-close with Sheldon's horns, don't discredit one of his research papers!
"The Troll Manifestation" (Episode 14, Season 8)