Vincenzo's gravestone roasts him with Salvatore's own nickname for him — from beyond the grave.

Vincenzo Cilli's gravestone in Liberty City Cemetery reads 'Not so lucky after all' — a brutal callback to how Don Salvatore Leone used to call him 'lucky' for getting to mentor Toni Cipriani. The cemetery itself is another myth hotspot that mysteriously vanishes from later GTA games set in 2000 and 2001.

Source: Vincenzo Cilli's Ghost — CC BY-SA