Mewtwo brings a long a potential game breaking glitch to Smash!*update* nintendo confirms patch in works, but more issues are found than originally reported.

[pokoko]

tbone51 said:

Yeap, small mistakes will be made, kinda funny only other nintendo game i seen with something game breaking glitch was also not technically made by nintendo though they are apart of them (gamefreak with pokemon XY)

Who made Donkey Kong Country 2?  It had a glitch that not only could destroy your saved data but brick the entire game itself.  Up there with the Pokemon glitch and Playstation Viewtiful Joe 2 demo glitch as one of the worst in video-game history.