Infinite 1UP Glitch Found in Super Mario Bros. Decades Later

There's life in the old game yet.

Proving that old games can carry secrets even in the internet age, someone has - allegedly - unearthed a glitch in the 1985 NES classic Super Mario Bros.

This video uploaded on YouTube just a few days ago shows that with a little self-sacrifice in a two player game, infinite lives can be yours. Let retro enthusiast site Retrocollect - which first drew our attention to the glitch - explain further:

"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."

Have any of you made this discovery? Is this the real deal or a convincing fake? If it's the former, it's remarkable that it's taken this long for someone to dig it up.