One mushroom makes you larger, another makes you small, green is for 1Ups, and then there’s this one… Chances are that it will turn you into a frickin’ lunatic with a bloody trail of carnage behind you. Bowser won’t be any trouble at all, but before you rescue the Princess you should let the effects die down a bit and maybe clean yourself up. You won’t get a very warm reception if you’re wearing Bowser as a hat.
“Say No To Drugs” by Harebrained shows Mario getting a little carried away with the magic mushrooms. There’s a trail of blood and bones and the castle’s on fire, but it looks like he’s having a good time.