OK, so the thing about today's hackers is that they're often strikingly funny.
So even if you don't care about javascript or emacs, much less javascript and emacs, you should go read Steve Yegge's discussion of implementing javascript in emacs lisp because all of the digressions and other silliness are sure to make you laugh.
I mean, here's Steve discussing the name:
In that blog I mentioned I was working nights part-time (among other things) on a JavaScript interpreter for Emacs, written entirely in Emacs Lisp. I also said I didn't have a name for it. A commenter named Andrew Barry suggested that I should not call it Ejacs, and the name stuck.
Via (who has his own history with Emacs)