I've always had a soft spot for it. It's the chorus. It just makes you feel nostalgic. Most of these outtakes have that effect. Carousel, Got The Hogs, and Hot Street.
I personally say Behind The Mask would've easily fit right after WBSS. It's got the most verve of all the outtakes. In fact, for me, it's way easier to see how Thrillers outtakes could've made it than most of Bad's or really any of Dangerous'. Streetwalker, maybe, just maybe. But I prefer APOM. And Someone Put Your Hand Out, well, that's not even an outtake, as far as I'm concerned, it's a bonus track.