Celgene Corporation (CELG)
The three most annoying and painful things about trading are:
1) getting a bad fill
2) getting stopped out and then watching as the stock turns strongly around in your direction and continues that way the rest of the day
3) breaking your own rules
I did all three today so it was a sucky day:

What an annoying fill - I mean 8 million shares were traded by the time this happened, why am I getting filled 16 cents below my stop (over 1/2 R)? The minute before the low was 41.5 and the minute after it was 41.41 - I get filled at 41.2 and it never went lower. Anyway, this pissed me off and it made things worse to see CELG continue to make new highs all day long.
What I think made me break my rules and over-trade was that I felt like I'd miss out if I didn't continue to trade. I missed out on CELG and the market seemed strong, so I didn't want to miss out on the rest.
Now I know that when you are annoyed or pissed off, it is best to stop trading for the day.

Your hard stop was taken out on purpose imo. If you were the market maker wouldn't you do the same, you know it is going higher, pick up some cheap shares for the ride. The pro's all seem to use mental stops. I am not a pro and I have paid the price trying to master mental stops but I think it is worth it in the long run.
Thanks for sharing!!