Keeping my 9 month old out of mischief

If I turn my back for a minute my son is in the bathroom, flushing the toilet, or unrolling the toilet paper.

I have told him no over and over but that doesn't seem to stop him. I don't feel spanking is the right answer in this case but he does need to learn to mind and know his limits. any ideas?

At this point he does need to know his boundaries and you do have to set limits, but I see nothing wrong with getting a baby gate to keep him out of there for a few months at least to break the habit.