When the Dentist Gives You Nitrous Oxide

I never got nitrous. I probably had five or six cavity fillings as a kid, and I always, always, got a large needle stuck in my mouth (I’m assuming it was lidocaine or some variant thereof.)

I feel like I missed out on something cool.

There is indeed an audio effect called flanging; you’d have to listen to examples of it and let us know if it’s similar to what you perceived when you were accidentally misusing N2O cartridges.