Here is a fun exercise. Ideally it would be nice to sit in a room full of newbie traders and watch them. Since I don't know any way to do that, the next best thing is an online casino blackjack table (or a real one if you can). I put $100 in and bet $1 at a game, but just so I can hang out at the table. I watch the other players' bet size. I watch people take a few losses then all of the sudden their bet size increases ten-fold or something like that. Either they win and the cycle repeats, or they blow out.