The amazing motorized Lego Monster Dino. He walks, roars and definitely doesn't need an introduction.
And to make this guy even better, you can reconfigure him into a spider or even a crocodile. But you will need a butt-load of batteries (6AA, 3AAA), $89.95 and a bit of time to put together the 792 pieces.
Article Link with video showing awkward motion (Gizmodo)