Bear with me as I don't really know what I'm talking about. I attempted to remove an old bathroom cupboard that had a light mounted on it. I turned the electricity off for that room down on my breaker.
When I accidentally touched the black wire, it zapped me a bit. I'm not sure why that was still live since the rest of the bathroom power was off.
When I went to remove the fixture, the black wire touched the white wire and sparks flew. Now I want to know... now what? I'm not even sure what words to use to search for help on YouTube or Google.