I know this isn't 'our' Jack but the blue crystal entity posing as him in Cold Lazarus clearly relives his horror, grief and regret for not locking his gun away and causing the death of his son, so I'm using this scene to fill the prompt. Personally, I prefer the colour version because it's more pleasing to the eye but I think the de-saturated one seems to project more angst so I'm posting both versions.
After much deliberation I kept within my select fandoms using this prompt even though I was mega tempted to do one for the movie Twister. In fact, if I hadn't defaulted my slave drive to region 1 to cap The Sentinel DVD's I probably would have relented and gone with that. So, in the end I went with Stargate's episode Absolute Power and tried to project Shifu coming out of the tornado and meeting everyone.