Yehhh, but... that's exactly what people say to themselves when they start. It won't happen to me because I (insert whatever here). Your brain may start to say different things without you really noticing, or if you do notice, it may seem to make a different sense later. You might want to have more safeguards than just this. An example of one is tell someone you trust what you are doing, talk to them about it, and write down somewhere, that if they tell you to stop you will stop. Even if they have changed. Even if they are a stupid idiot who doesn't understand anything and you don't even know why you were friends with them before etc. etc. etc. Slippery slope is slippery.