My worst time was when Mrs Ch & I were going at it doggie style I think. I'd dislocated my right shoulder a lot so it wasn't as strong as it should have been. But you know our it is, you getting going faster and faster, deeper and deeper and .... the satin sheet moves ... you start to fall and put out your hand and .... pop out came the shoulder. Couldn't get it back in, my shoulder that is you perves, so had to go to after hours surgery.
That's not the worst.
The stupid doctor, who had access to my files, said he had to know how the injury happen. A bit embarrassed I said I was on the bed with my wife having fun. Not that hard to figure out, you think. No he needed more info otherwise the ACC (Government accident insurance) won't cover it. So I explained slightly different, but, he wanted more info. Four times this went on, while he prodded and pocked my shoulder - and no pain killers), finally, almost in tears, I quietly said my wife and I were on the bed making love I was behind her and the sheet moved (he said he needed more info - wtf).
I ended up yelling "I was fucking my wife from behind and the sheet moved and so did my arm" - it was an open planned office. My wife went red and looked daggers at me, the doctor went red and shut up. In my excuse, my shoulder was hurting like fuck. I actually chipped bone off and ended up having a big op.
Always been careful with those sheets since.