Tyler did something similar a few months a go where he was under my bed and then suddenly came running out (well, sliding out really) backwards looking really worried. As he had never chewed cables before I didn't take much notice, just told him to stop being silly. Then he did it again (Tyler doesn't learn from his mistakes

) so I had a look at what he was doing and saw that he had chewed the cable for my bed side lamp down to the wires. It was only a little bit exposed, but enough for him to get a little electric shock.
The thing that got me though was the fact that he did it twice!