Japanese games on American 3DS or vice versa?

[manuel]

I know that Nintendo says the games are region locked, but has anybody tried playing Japanese games on an American/European 3DS or vice versa? Maybe a gaming blog/site?

I think it was Joystiq who cut off the nob of a 3DS card to fit it into a normal DS, only to discover that it doesn't work. :/

But I haven't heard of anybody actually try to play a game from a different region. I'd like to know what kind of error message is displayed...

BTW: Stupid region lock!