Skydiving, once, in my 20s. Not sure if the chute was on wrong, being slightly over the weight limit was a factor, or if it was just genetics, but when the chute opened, the jerk caused a loud enough pop that my instructor asked if I was okay.
I lied of course, the adrenaline kept me from knowing the deal, anyway.
The first time I threw my back out, after, it was from picking up a piece of paper. These days, when I have the least pain I can still tell my back muscles are as tight as a garage spring.
I had never known a moment of back pain before that day, and I don’t know what it’s like to walk a mile without back pain now.
Jump Man, Space Taxi, and Ghostbusters on Commodore 64. I was using that version of the Ghostbusters song as my ringtone for years, back when I got phone calls ;)