George McClellan kept the Necco Wafers under his saddle when he wasn't in battle - which he never was.
So I was trying to source that gorgeous poison book that’s making the rounds (it’s tragically not period—it’s a “historism” in the style of the 17th century) and I found the auction site it came from, Hermann Historica, and I’m never leaving.
The magic square on the skull is SATOR AREPA TENET OPERA ROTAS.
e: oh right! click on images for provenance.