The first and last time I was on a trampoline, I tried to do a backflip and landed on my chest in a full scorpion. My spine whipped and cracked pretty much every join in my spine. It was loud enough for the people standing next to the trampoline to hear.
I felt such unknown levels of comfort and relaxation that I was worried that I had just paralyzed myself, until I realized I could feel my toes.
That was the only time in my life I have experienced such nirvana, from the tension and pressure being released from my back to the euphoria of not being paralyzed. It was a serene tranquility that I imagine only the Buddha knows. I was in a moment of Zen that can otherwise only be achieved through dying of natural causes while meditating.