Sorry but Im calling BS on that one, LOL.
Had a Robe of Vecna once in Baldurs Gate...don't recall anything about severed heads though.
Being a DM means having to deadpan lots of stuff.
It is rather hard, a sense of sadistic humor is needed.
Like, having a “choose your doom” deck of “what kills me now” cards that the player must draw from when the DM notices they didn’t do a proper spot check upon entering a room.
I played Baldurs Gate several times - and the sequels. I don’t remember a Robe of Vecna?