In the past year one of our suppliers of transformers, one of the biggest suppliers around basically stopped any shipments because their single winding machine broke and it was awhile to fix. Probably a multi-million dollar machine and they only have/use one, they may keep some spare parts sure, but they must have had something major break.
One of our customers was a nut roasting plant, I believe the biggest in the North East. Their big roaster broke caused a major industry issue.
Had customers that wrapped candy for Hershey. Machine custom setup for wrapping a particular product. It broke, but caused major issues because once again, you don't keep a second unique machine laying around and you don't just call up an order a new one.