The following was inspired by a quote from an article in USA Today:
"Hiddleston explains that as Loki's anger grows, so do his horns. 'It’s all that jealousy. It might be a crazy analogy, but the more Pinocchio lies, the bigger the nose gets. And the more Loki's pain and rage expand, the bigger the horns get. Also, they just look more badass. By The Avengers 3, I’ll be like a magic elk.'"
Well, Mr Hiddleston, if you want to be a magic elk, far be it from me to stop you.