I'll stay with carving jack o' lanterns, especially going the Druidic route and hollowing out turnips.
Mostly through negligence as an unintended side effect, though some did it intentionally, terrorizing or controlling the local populace. There was even a cult who deliberately infected themselves, embracing it as a form of enlightenment. Yes, you read that right.
[CW; Cult described]
Mostly through negligence as an unintended side effect, though some did it intentionally, terrorizing or controlling the local populace. There was even a cult who deliberately infected themselves, embracing it as a form of enlightenment. Yes, you read that right.