suppermariobroth:

In Super Mario Bros., if Mario touches a vine when the block it has grown out of is exactly halfway off the screen to the left (the vine itself should be invisible due to being programmed to not display when it is partially offscreen), pressing Left will teleport Mario to the right edge of the screen.
_{Main Blog | Twitter | Patreon | Store | Source: myself, Super Mario Bros. (NA, NES) in NES emulator}