Whew. Had to wait for a moderator with scissors before I could even read the post :) (Do some browsers auto-wrap? None of mine do, though the text editor does by default.)
That pattern of
looks like an object lesson in what can happen if you leave off the [L] flag and/or don't anchor properly.
What's the source of the crazy URL? If it came from anything other than an error on your own site, you don't have to redirect it. You can always meet it with an unequivocal 404: "You're delusional, there's no such page and you can't possibly have imagined that there IS such a page!"