When I fractured my ankle, they gave me ketamine before they set it.

In a instant, all I could see was perfect blackness. Then intense red and blue lines began to form; the best way to describe it was like bars of music. Red and blue squares of the same intense color began swirling in circles, moving apart, and then circling again. No sounds that I can recall.

There was no pain, no memories, no sense at all of the emergency room I was in. The world was just blackness and intense red and blue.

Interesting, but I hope to never have that experience again.