Elder Scrolls IV: Oblivion. No, it's not in a "Hey, this game looks like Oblivion" way. It's more like "Hey, why are you seizing my copy of the game as evidence?" GamePlasma has the image above and many, many more examples.
What's nuttier is that this game has actually been around for a while. It was originally released in Asia way back in November of 2007, though it's just now getting a North American release. It's criminal, but it's also kind of inspiring. Apparently, if you dream of making games, all you have to do is find another game, and then make up a guy to put in that game and then sell it. If we weren't so busy liquidating our stock in Majestic Studios we'd be slow clapping.
(Oh, and just so you know, Bethesda tells us they don't have a comment and Majestic's email address doesn't work..)
Update: No one is safe from Limbo! It seems the game also stole an environment from Eidos' Thief: Deadly Shadows.
Update 2: Just heard back from U.S. publisher Tri Synergy who tells us that the similarity between the two is "striking" but "We're just as shocked as anybody else and we've put a line in to Majestic. We had no idea that any of this had been in the game and things would have been different had we known." They're still exploring it though, so we hope we'll hear more soon.