Back in the late 1990s some electronic/industrial labels were fond of using nice looking metal boxes instead of the typical jewel case. These cases look great (photos: closed, open), but their design resulted in almost every disc they contained breaking.
In this case design the disc was pressed on to a crimped metal protrusion in the center of the case. Due to the tight fit this caused almost every CD in these cases to crack on removal, or sometimes simply when being stored. As shown above, radial crack running out from the center was the result. Sometimes this would result in what was effectively a very scratched disc, other times it’d cause the entire disc to split in half. It’s a terrible, terrible design.