An alternate ending where you gather a ton of all different kinds of items, dig out most or all of a level, and become the new black market.

If you escape the Black Market by branchporting, One-eyed Sam will pursue you on the ascension run.

When you’re hallucinating, show the Black Market as “Sam’s Club”.

In UnNetHack and other variants with a black market, you never hear “You hear someone cursing shoplifters” in the black market, unless you have angered One-Eyed Sam.