I actually tried that once when I was 19 or 20. Boy, that was amazing!
It gave me this visual of my brain surrounded by bubbles and the high was so euphoric. But I knew what I did was dangerous somehow and so I never did it again.

What's odd is I no one ever told me I could achieve a high from inhaling nitrous. I did it on my own. Later on when I got a job at a pizza restaurant, I learned that a customer who worked at the furniture store across the road and who came in regularly to eat had died because inhaling nitrous that was stored in ballons. I guess someone obtained a supply of nitrous, filled balloons with it and sold these balloons.

I guess what happens is that the nitrous deprives your brain of oxygen for a short duration. But too many inhalations is extremely dangerous as I found out.