never. I usually give it a few twists and turns, see it as pointless and confusing, and usually throw it or put it back where I found it. Who the hell invented the damn things? I want to go back in time, and throw one at his face.
I have a very visually-oriented mind, but god damn... I don't get these things. I love puzzles and whatnot, but I find about the only way I'd enjoy a rubik's cube was if I was being tortured or thrown in jail and I needed a tool of mental torture to take my mind off the world, for a few days - hopefully I'd figure it out by then.