Up until watching this video I was still unsure about the purpose of Vine, but now I know. It's to watch short videos of Arnold Schwarzenegger driving in his car, shouting at things.
Watch the video below.
I hate to ruin the illusion, but this video doesn't feature the real Arnold, but rather a mighty impersonation from Mad TV actor Will Sasso. Being from England, I'm still not entirely sure what Mad TV is (I've been led to believe it's like Saturday Night Live, only more awful), so I Googled Will Sasso and turns out he was also Curly in that terrible looking Three Stooges remake. I'm still not going to watch it, but I thought it was worth mentioning.