magnitizm. If you have a magnitized cable that goes from... let's say your gameing system into you vcr. And you, by accident, put the cable into your tv's cable slot, it would realy mess up your tv....
On the body? High energy radiation, such as the EM waves beyond and including UV, i.e. X-ray, gamma. Have the adverse effect of damaging human DNA, which over time causes mutations, resulting in...
it dependsif it's Spongebob then it rots your brain, but if its like the Discovery Channel and actually teaches you something (cheetahs are the fastest animal on Earth) than that's ok and your brain...