In 1986’s Super Mario Bros.: The Lost Levels, a poison mushroom is among the items available for Mario and Luigi to grab on their quest through the Mushroom Kingdom to save Princess Peach. Unlike every other item seen in the then-nascent franchise, this item was designed to hurt the user; it looked, on first glance, like a regular power-up mushroom, but if you grab it, you’ll either shrink or die. It was a stunning piece of darkness, even betrayal, to introduce into the friendly, smiley world established in the Mario video game franchise thus far.