I'm wondering how far can we go before having trouble with "not-nice-things" in games ?
Assuming -- based on the fact that you introduced yourself as having "a sick and twisted mind" -- that you wouldn't censor yourself for ethical or moral reasons, there are three main limiting factors that might impact how far you can push things and what sort of "trouble" you might attract:
- Legal restrictions. Certain types of content are either outright illegal, or are tightly controlled. Depending on the type of content you might risk fines or jail time, you might find yourself unable to sell an uncensored version of your product, or you may be required to comply with strict licencing terms. You will need to obey your local laws, and potentially laws in any place your game might be distributed.
- Offensive content may appeal to a smaller niche audience and may be a turn off the mainstream. This may limit the potential income of your product, and unless you're willing to make a loss will therefore also limit how much you can spend on developing the product.
- Sufficiently offensive content -- where sufficiently is completely arbitrary depending on the audience -- may also result in offended parties taking you to court or attempting to disrupt sale of your product. This may result in legal expenses and may result in distributors that are legally allowed to carry your product may still choose not to do so if they feel it would cause customers to boycott.
As Tom says above, it's all about exactly how much risk you're willing to take and what sort of "trouble" you consider to be a deterrent.