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Someday, when society goes fully paperless, paper cuts will be a thing of the past
(discuss.tchncs.de)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
We definitely called them cardboard cuts, can't say how universal it is but every job I've where I've handled a lot of boxes it seems to be in pretty common use