There are some things in World of Warcraft I wish I could have done differently. Sometimes I wonder what it would have been like had I rolled a different class other than a priest. There are bosses that I wish I had killed before they became irrelevant. Alas, it all boils down to time that I wish I had. As both a GM and a player, it is difficult to foresee the results of your actions and you never know what the correct choice is. Even when killing bosses and healing my raider group, I've made crucially wrong decisions. And it sucks when I realize a global cooldown spent on a Pain Suppression instead of Power Word: Shield would've saved a wipe.
Have you ever experienced a moment or made a decision that you've regretted since?