Quoting Aeroscreens: I know of one that that let go and I believe it is now used as an award at one of the local area meeting's Christmas dinner, don't know the story behind it though.....
When I had my 1993 chassis repowdercoated by Arch I got them to add 2 retaining hoops along the tunnel for that just-in-case scenario...
That would be Peter T's shaft 😳, it let go just after a rolling road session. He was ok, but it smashed a kevlar seat and wrapped it's self around the hand brake cable. Thus bring him to a quick stop 😳, it did look nasty but he was ok .