I've been playing guitar for something like 7 years now. Despite that fact, I am apparently not a rock-legend yet. False advertising if ever I've seen any.
However, I am fairly good at it. Probably not worth the incredible cost of guitars, books, lessons, and the infinite number of picks that disappear, only to reappear as soon as you buy more, but still. I'm competent enough. Aside from writing, it's basically the only talent I have that's worth talking about, since I never had the brain for programming. That, and probably Super Smash Bros. I can drop a mad combo if I try hard enough. XD
Well, I'm fairly good at coming up with random weird YouTube videos too, but that's not really a marketable skill...