I've done it personally a couple times since 1981.I mean, classic D&Ders will know many characters with 18/00... but how often has it been seen legitimately rolled? On the first try (no "that was a practice roll" or "that was an 18/10, roll ,and kind of lame, lemme retry").
I've seen about half-a-dozen.
I'll note that some players do exceed the odds on 3d6 throws or even 4d6K3 rolls, possibly by semi-conscious ability to control release to get desirable results.
I've seen a player roll 3× 18 on a single character twice.
I pretty much don't use rolled attributes anymore.