Some publishers of Nintendo DS games like to install their own anti-piracy measures, which while being unable to prevent pirates from physically copying a game, can prevent people from enjoying those pirated copies.
It appears as though the DS version of Michael Jackson: The Experience DS is one of those games. Users who grabbed the title illegally are reporting that there are two game-breaking features that are triggered if a copy is detected as being illegitimate: one is that important on-screen prompts are missing, and the other is that a vuvuzela plays over the top of all of MJ's hits.
You can hear an example in the clip below. Well played, Ubisoft. Well played. Maybe you can even start doing this to PC games, instead of just pissing off your paying customers!
[via Tiny Cartridge]