I say when my butt falls asleep on the job, it's time to go home.
The chairs are ample, which given my big ass, I'm quite thankful for, but I tend to forget that I can't sit leaning back for too long a period. I've fractured my coccyx twice (don't recommend it) and the second time caused my tail to go just a little flat on the end (I've seen x-rays...it's a little long too), which must sit on a blood vessel or something when I lean that way and my butt falls asleep. I know, I'm weird.
So I guess that that would be an NG for worker's comp. too, because it's a pre-existing condition.
Reason for complaint: Flat tail causes butt to doze off
The things that go through my head.....