It came up in one of my fun history classes. Forks were a late-arriving type of silverware, so not everyone caught on to how they were used immediately. Some peasants decided that forks were tools for picking out the eyes of armored knights. At the time, a knight was like a human tank. Even if you got him down off his battlesteed, he remained a tough nut to crack. But if you could knock him down, he was somewhat more vulnerable. Then if you had a fork, you could stab through the narrow slits of his visor and, if not kill him outright, at least render him useless as a combantant.

In some places, the nobility responded by banning forks. LOL history LOL