When you're holding your dog, and he decides it's time to get a boner.
Also some jackass sent me message saying that libertarian socialism is an oxymoron, yeah I don't think you know that the term "libertarian" was first used to describe it in a political sense, was by French anarcho-communists in the mid 1800's, to describe themselves but whatever, I really don't feel like debating political terms on OK Cupid, just because you buy into the modern perverted version of Libertarianism.