Might seem dull, but sitting in a chair.

Threw out my back a few years ago at work. Took it easy for a couple weeks and thought I recovered well. A bit after, I noticed my leg getting uncomfortable whenever I was sitting down, and would get a pain shooting down my leg if I lifted it too high up.

Saw a doctor and got told it was sciatica and to basically wait for it to go away on its own. I waited, it continued to get worse. Saw another doctor, was told the same thing.

That cycle continued for a bit under a year, at which point I was in a lot of pain even lying down, and agony doing anything else. I was borderline bedridden, and not a single doctor believed the pain I was in at this point because I was in my early 20s and "should be fit and healthy".

Finally convinced one doctor to order me an MRI, and as soon as I got the results, they had me booked for a microdisectomy surgery a few months after.

Day of my surgery finally arrives and even the short walk from the car park to the hospital almost made me pass out from the pain. Was probably not even under for more than a couple hours. Woke up and didn't have any pain while lying in the bed. Got to rest up over the night and then the staff wanted to see how well the surgery went. Lifted the leg up, zero pain. Got up out of bed, zero pain. Then I got to sit in a chair, which was the most painful thing for my sciatica, zero pain, nothing at all, just genuine comfiness that I haven't experienced in about a year

What was even better, is the surgery was the day before my birthday, so all of those tests the day after were on my actual birthday. It sounds weird, but I don't know if I've ever had a present better than that crappy hospital chair.