Poison Mushroom

The Poison Mushroom is an item that kills anyone who eats it. It's appeared in lotsa shames related to Mario and the gang, but they're already so shameful on their own that listing them here would be redundant. Bowser tries to feed these to Mario whenever they go golfing together, raising the obvious question of why Mario invites him in the first place.

How to Make a Poison Mushroom
Poison Mushrooms aren't like their regular Mushroom cousins--they don't just grow by themselves all willy-nilly. Instead, they have to go through a complicated four-step process to turn from an ordinary Mushroom to a poisoned one. Finally, 4. Convince the mushroom that Bowser has all the answers. This is usually done by making the mushroom play Trivial Pursuit with Bowser while his kids whisper the answers into his ear.
 * 1) Make contact: a member of Bowser's Army, usually a Koopa or a Goomba, makes contact with the mushroom and takes it to Bowser's Castle, introducing it to the Koopa Soup.
 * 2) Disarm the mushroom: the easiest step, since they don't have any arms.

Note: the more astute readers of this wiki might notice that there is no third step. This is because Bowser, for all his strengths and powers, has poor attention to detail.

Appearance
Poison Mushrooms have skulls on their caps instead of spots as a tribute to the Dry Bones Gang. None of the other army members thought this was a good idea, but the Dry Bones Gang doesn't get to do as much in Bowser's Army as everyone else, so Bowser decided to just let them have this.

Trivia

 * They're all bikers. You just can't tell because they don't have limbs and can't ride their bikes.
 * They tell really dirty jokes--if you asked them, they'd probably tell you the one about the mudhole, but you probably wouldn't dig it.
 * They're so rude that they want to burp all the time, but they don't have mouths or digestive systems so they have to ask other people to burp for them. It's really embarrassing.