[endeavour]

I remember being impressed that the BeOS media player could play audio CDs backwards in real-time. Not really sure why you'd want to but it was quite a good party trick.

[LoSboccacc]

yeah, could transcode anything to anything in real time and feed it to an appropriate player.

BeOS is the only OS which implemented the same UX of unix pipes in a way that actually made sense in a graphical environment.