People... I mean... I think maybe it's a real screenshot, because:
- It's a 320x200, 8-bit paletted image;
- the words in the upper-left corner ("...fuck, I should've forseen this.") use the AGS text font, the same Yahtzee used in his games;
- there is a mouse cursor in the image;
- it uses the same photoshop-lightning style Yahtzee used in his games;
- it is coherent to the storyline.
Anyway, if it's a fake, I can just say it's a good fake.
I second what David-Kyo said, and add this-
Yahtzee would have used more detail with the Chzo thing. I mean, think about it. We've got two examples of what Chzo looks like: his eyeball from TN, and the latest screenshot on the main page. There's a lot of detail there. With this fake screenshot, it looks like someone used MS Paint to make a blob shape, fill it in with crap color, draw a stupid eye and fangs on it, then use Photoshop filters. If it were Yahtzee's, he would've some added texture and shadows, anyway.
Also, why would the Mephistopheles be there? I mean, it's implied that 'John' gets taken to jail (or something like that). Why would he still be on the ship?
In closing, shut up.