[layer8]

Some old console games have bugs that effectively allow to reprogram them to whatever you want, just by pressing the right buttons on the gamepad in the right sequence at the right time (due to the bugs leading to out-of-bounds memory writes or similar). In this particular case, SMB is being reprogrammed into streaming Bad Apple from controller input, where the data being streamed is input via thousands of button presses per second.

You could in theory perform this on the original SNES hardware with the original SMB game cartridge, if you can press the buttons on the gamepad fast enough and with the right timing.