Just like /all shows the current best, hot, top, whatever, have a "/fall" sub filter that shows the worst, coldest, whatever.
So:
/all is like it currently shows: the best
/fall is the worst.
And holy crap it's hard to think with all this nonsense floating around the page. You really hate me today, don't you??????
So, it would show the posts with the lowest score? You would see only the spam
Dunno what you're talking about, I see the site like it always is