Kris and my dad chased a cow in the barn to pull her calf and saw it was both upside down and backward. This is pretty rare, so Kris called our vet, Russ.
Russ used a tool he said usually didn't work, but the alternative was a c-section, which we've never done since we've been here.
It was a bar with two loops on the end. They looped one end over the calf's legs and twisted with a bar, trying to get the calf to flip over. It worked! They still had to pull it out backward, but both the cow and the heifer calf were fine.
Not really a holiday for our vet, either. Good thing we're friends with him, so it could be considered partially a social call. Except for the bill!