File:SMB How to Get to Minus World.gif

Summary
In World 1-2 of Super Mario Bros. for NES, Fire Mario runs, lands on the front of the exit pipe, and quickly crouches and jumps to reach a peak where the exit pipe crosses the ceiling. At that moment, Mario stops crouching and is ejected through the wall to reach the warp zone and ducks into the pipe to the Minus World.