あなたを犯人です。

I know this sentence is grammatically incorrect, but I've seen this sentence many times. Is this one of the 2ch language? or does it have some other meaning?

It's a famous typo in the game Tsukihime. It's supposed to be あなたは犯人です- "You're the criminal"- but with the typo it sounds more like "You're going to become the criminal." So the character that says it was nicknamed the "Brainwasher Detective."

Thanks for the info!