There is a story about that happening to David Wells the morning of his perfect game. But that could have been the massive hangover he was dealing with. Then again the story includes him and Jimmy Fallon just drinking the night away at Saturday Night Live’s season finale afterparty hours earlier. One problem, SNL’s finale that season, the 23rd, aired a week earlier, 5/9/1998, while Wells’ perfecto was on 5/17/1998. I supppse I could give the faulty narrator credit for the perfect game happening on a Sunday though In any event, obviously not in Koufax’s case when it comes to major inebriation the previous day, I think most of those stories come from distracted hurlers forgetting the plan, as well coaches/managers projecting the idea that rotations were meaningless, and they could have had the same guy start games in a row if they wanted to. So I’ve taken that notion about not telling a pitcher they were starting until that day, with a ton of salt grains