Rubber Man/Analysis

Required Secondary Powers
Flexing yourself into cartoonish shapes would be great fun, provided you were strong enough to support yourself enough to stand up. There's also the issue of organs and blood. Aside from the obvious repercussions of flattening yourself against a wall, the human heart isn't designed to pump blood into an arm that just grew one hundred feet. This power would also have to extend to their clothes, otherwise it'd be very uncomfortable (or publicly embarrassing).