I've mostly seen this on HN - but I don't visit a lot of forums. Looks like PHP is out and Javascript is in; lots of people have an axe to grind with Javascript (e.g. gp - the segue is almost comical). I can imagine an article on a new dental procedure, with the first comment "Root canal is painful, just like javascript ha ha amirite"

I would be interested in finding out the proportion of HN threads that end up having 'javascript' mentioned when the original discussion was not remotely related.