I wouldn't mind paying for YouTube, but their current subscription price is extortionate given what I'd get out of it vs. much more premium streaming services. It's funny how their 'Lite' subscription trial seems to have disappeared off the face of the Earth - I'd probably go for it at that price.
Duke Nukem 3D, absolutely no question whatsoever. The first game I played that had environments that aped real life and had real life levels of interaction detail... Light switches, CCTV cameras, so much incidental detail and environmental transformation. No other game had done that to the same extent before then and I'd argue that no other game has done it since!