SY had a recurring lick they'd reference in the final melting down seconds of a few standard tuning songs circa '89. It's been a good 15 years I've wondered about this, and it appears I just needed to take a closer listen to an album that's not exactly unheard of...
Computer Age
Burning Farm
Blowjob? (Mildred Pierce)
(sorry, couldn't find a link for the demo version of MP!)
I always wondered if they'd lifted it from somewhere...and I happened to catch the end of "Police Story":
Police Story
Case closed, or..?