Poison 1-Up

A Poison 1-Up is a type of Poison Mushroom only implied in Super Paper Mario. When Mario goes to The Underwhere for the first time, a Shayde will ask Mario how he got a Game Over and begin listing him possible ways he could have died, such as falling in a Bottomless Pit. One of these ways was "eating a Poison 1-Up", which is therefore thought to be a poisonous 1-Up Mushroom. However, as stated before, a Poison 1-Up has never been seen in a Mario game, only mentioned. Also note that the Poison 1-Up may not even exist, and the game's writers made a mistake and confused a normal Poison Mushroom with this Poison 1-Up.