So assume you have a working time machine, and you don’t want to use it for anything boring like picking winning lottery tickets or teaching the Elizabethans about penicillin. Nope.
Instead you decide to dip into your MMO of choice (or maybe even switch games altogether) and use your foreknowledge to have more fun in the game.
If you could go back in time, is there anything you would do differently in game?
Would you roll a different race/ class/ server? Would you have gotten in on a different game at the beginning (maybe picked up a lifetime sub in a game you passed up, for example)? Would you have used your knowledge of the in-game economy to make some easy gold? Would you have joined a different guild? Booted someone who was going to cause a problem later on? Exploit bugs that later get fixed?
Or maybe you’d even know to take a break and skip a patch altogether until bugs got fixed a few months later.