It’s been HOW long since the plumbing brothers first jumped their way into hearts everywhere in Nintendo’s “Super Mario Brothers”, and we’re STILL learning things about the beloved game.  From site RetroCollect, we have a “new” glitch:

First, you must first take player one’s Mario to the second level of the game and throw away your first life. With Luigi taking over, player two must traverse all the way to World 5-2 and find the hidden beanstalk block halfway through the stage. Once there, Luigi must start climbing the vines, however, he must await – and take on the chin – an incoming projectile from one of the Hammer Bros. Upon being hit, once player one resumes control of Mario, the beanstalk from World 5-2 will start growing in World 1-2, providing all you need to infinitely kick shells for unlimited bonuses.