Neopets: The Darkest Faerie Glitches

The Mother Glitch of them All: The REWIND Glitch
So, you're at the very end of the game, feeling great, and ready to take on the final boss, right? Then, all of a sudden, you find yourself back on the farm in your rags. What just happened? Well, my friend, you've just found the worst glitch of them all. I call it the REWIND glitch. Basically, you're just stuck replaying the game, unless you've saved.

And yes, even then, your save file can reset itself to start the game over. It's rare, but cursed be he who finds it!