$Tesla(TSLA.US) thought it would rise to 450 before falling, didn't expect it to start dropping at 430. I saw a big shot making a statement yesterday, and when he came out to prove he was right, I had a feeling it was going to fall, and sure enough, it did.

My own operational issue is that when it falls, I always think it will definitely rebound, and when it rises, I always think it will definitely pull back. So I buy the dip when it's rising and buy the rise when it's falling, going against the trend. But life doesn't have that many miracles or reversals; you just have to go with the flow.