I was casually playing Mario on RetroArch on my mac. I had just started a new game and was playing through 1-1. I was on the second pipe of the level. i walked off of the pipe and jumped as soon as i hit the ground, and was going to hit it one block (as in 16x16 pixels) short of the top, but then i landed inside the pipe as if the top block didn't exist. I didn't get a screen capture because i didnt realise that i clipped through until after i jumped off. Could this be a new speedrunning technique to save a few milliseconds? or is it just a waste of time. Anyone else?