I voted "I sometimes cheat (Offline)", though not a lot, it's quite fun to see how ridiculously overpowered you can get in some games, the game that comes first to mind being strategy games, Disicples I and II, if anyone knows those, where it was practially impossible to invade an enemy player's keep, be it NPC or a human oppenent, unless you created several heroes with the best of the best creatures and items.
Another honorary mention would be cheats in the GTA series, having a tank or whatever and just plowing through the city can be quite hilarious.