I think people who perform these kinds of pranks vastly overestimate the positive reactions they get.

FTA,

> Having sent this out, I fielded a few anxious calls, who laughed uproariously when they realized, and I reset their printers manually afterwards. The people who knew me, knew I was a practical joker, took note of the date, and sent approving replies.

I doubt a single person "laughed uproariously". Most often they probably rolled their eyes and gave a sympathy chuckle. The people who knew he was a "practical joker" understood how much of this guy's ego was tied to his inaner sense of humor and laughed along to get out of the conversation with him.