Well, this would be the single most obvious thing in the world if you ask me. If i was designing an app to scan those codes i woudln't just act on whatever content that the user might encounter but instead present him with whatever it is the QR code is saying.
So instead of scan->immediately open goatse, how hard can it be to go:
scan->Show user that the QR code contains a link to goatse and then they can decide whether to go there or not.
Likewise with all other kinds of content (usually it's just pointers though, like links to market, web sites, etc