I thought I exited my short position at some point today. Actually, I reversed it to the long... I tend to do this quite often. Some time later, I wanted to put on a short and when checking my TWS I noticed that my PL had increased by $300 (3 ES points for 2 contracts). Must be that beer that I am drinking... this is a perfect example of what happens to your PL when you do the right thing and then you don't mess with it, in this case because you forgot about it.