It only took 29-years, but someone has discovered yet another unlimited 1-Up glitch involving a magic beanstalk in the original Super Mario Bros. game. Before watching the video, note that you must beat the entire game once before this glitch even becomes possible. Continue reading for the video and a tutorial.
Here's how to try the glitch out for yourself: "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."