Today was the day of the year when champagne was invented.
If you consider all of the possible universes A where champagne was invented, and all of the possible universes B where champagne was not invented, you couldn’t do a champagne celebration of that august event in any of the A universes from within any of the B universes, because there would be no champagne to celebrate with.
I could even draw you a Venn diagram illustrating all of this. But that’s only because we live in a universe where, on this day of the year, John Venn was born.