I have a few LOL but my worst was a weight lifting accident I had in 2009. I was a big dude my first year of college. 250lbs and 12 percent body fat. I was pushing myself to hard one day and during a 500lb deadlift my foot slipped and I herniated my L5 disc in my spine. Long story short I ended up in bed for almost 9 months before I underwent a spinal discectomy surgery to remove 50% of that disk. I was close to needing to have those surrounding vertebrae fused.
Took me another year to recover and now I still have back problems.
I have also torn my rotator cuff LOL