I recently experienced something unusual playing Super Mario Bros. 3 on the NES Classic.
I don’t think it’s a glitch or anything, just something that I suspect happens very rarely.
I was in Desert Land, specifically playing level 2-2, and I was Racoon Mario.
I was successfully kept myself on the platforms above the watery portion near the end of the level. I jumped on the Green shelled Paratroopa and without even trying really also tail swiped the shell afterwards.
I like to keep standing on the Platform as it disappearing into the wall above the pipe just because I think it looks kind of funny. And then that the Koopa shell bounced off something and wound up in the last section of this screen endlessly bouncing off the Pipe I have to go into.
I managed to get into the Pip fine, but this was definitely never seen happen before, and I wonder if anyone else has, it seems like something that would require a lot of variables to repeat.