3 ms·
"One of the strangest cases" is perfectly grammatical. There is only one "strangest case", but the "strangest cases" can refer to any set such that every case
by cperciva 10y ago
"One of the strangest cases" is perfectly grammatical. There is only one "strangest case", but the "strangest cases" can refer to any set such that every case it contains is stranger than every case it does not contain.