Dark Fiber

True Story: I get asked... so many times; what is Dark Fiber and I can just not resist the opportunity to be a smart ass and say "it is evil fiber". Or something like that; fiber from the dark side, darth vader fiber etc. Then I try to coyly explain it. But it just always crack me up how many people, especially people who should know, what DF is. It's a goofy joke I know but most people chuckle about it once they understand what it is.