Rpietila said there would be a drop to low 400s in December. I held my fiat and waited. Sure enough, my phone started blowing up with notifications of falling BTC price. I waited, it hit 400, I bought, and it immediately rose hundreds of dollars. I said thank you to Rpietila for his advice. I am now up over 100%. Some fool I am...
Look at his predictions before that. I don't have a list of them in front of me, but I went through a few months of his speculation posts when he made that December prediction and found them to be generally wrong.