Today in Comics History, February 13: At this point you can probably just guess the stamps were poisoned or a knife pops out of the envelope or something like that

from "Poetic Justice!" in Haunt of Fear #12 (DC, March 1952), co-plot by Bill Gaines, co-plot and script by Al Feldstein, pencils and inks by Graham Ingels, colors by Marie Severin, letters by Jim Wroten
This is the story that's "gently borrowed from" (and which I made plenty of alt-text jokes about) in Atlas's Adventures into Terror #31. Tune it tomorrow to see the shocking conclusion of this EC version! Arroooo! Wasn't that scary, kids? Even Count Bully was scared, and he doesn't scare easy, let me tell you.