This seems to happen enough that I'm curious if people are using funny clients (though alikhan82 is new as of 5 hours ago) or if there's a race in the HN code. It seems improbable that someone would be typing this desalination comment into this article and not the one about Israeli desalination projects. @alikhan82 are you using the standard web page or accessing HN through some other client?
I don't find it that improbable to think it may have been typed into the wrong page by the user. If you open a lot of HN discussion pages first and then open the articles they link to via the discussion pages in new tabs and you switch to read an article (like I do) and you then go back to comment on it, I can see how someone ends up commenting in the wrong thread. Especially, I think, it would be easy to make that mistake if you have a strong opinion about the matter of the article because if you get worked up and eager to say something about it, you might be more focused on the comment entry box and not notice that the title and other comments don't match.
