From a reader:

Jonah,
I’m really hoping to out-Derb Derb on this one, but let me quote from
Prime Obsession regarding infinity: “If I say the sequence goes on
forever, I mean that no matter how many terms you write down, I can
always write another. ” (page 17)
This “Annie Get Your Gun” approach to infinity (“Anything you can do,
I can do better”) is helpful in looking at the world of alternate
realities (though it doesn’t explain why no one ever jumps into an
alternate reality and slams face-first into a rock or some such).
Anyway, hope I get this message in before his Mathiness checks in on
The Corner.

Me: Just for the record, my objection isn’t the concept of infinity. I’ve got an okay handle on that as far as these things go.

My problem is the idea that a whole separate universe with trillions of stars, planets and galaxies gets created ex nihilo from my decision to drink a Bud Lite instead of a Bud. If that’s not what the physicists mean when they offer these theories of parallel universes, they should explain it better. Because that just doesn’t make sense to me.