Hmm, a torus sounds like something you tried to turn inside out and got stuck doing it.
But then, can you turn a sphere inside out? If it's a closed shape, and you can't move it through itself, then it should be rather impossible to turn it inside out, or so I would think. Unless this is a trick question about ebedding it in a higher dimension first. But yeah, if this is a question about reversing the side of the shape, so the outside now points inside, then it'd still form a sphere.
Hmm, seems like we need a few questions involving a klein bottle or a mobius strip.