There are two things you can always count on with contemporary (which is to say “within the last few decades”) bedsheets: the fitted sheet wears out long before the flat sheet, and the flat sheet is easier to fold.
As a rule, I rotate through two or three sets of sheets, and toss the worst when I buy new ones. Unfortunately for this scheme, I was on the best set Sunday night, and apparently I thrashed enough to turn the Known Weak Spot in the fitted sheet into a major rip. (It was loud enough to wake me up, even.)
Fortunately, my criteria are not complex no polyester, no microfiber, ~300 thread count so snagging (whoops!) a new set proved to be relatively uncomplicated. (I am distrustful of packages claiming four-digit thread counts.) I went for a gold color this time, which will clash more with the comforter, so I have less of an excuse to put off replacing the comforter, which is starting to show Known Weak Spots on its own.