Wow, I met with a first time advisee recently who casually said she plans to get two PhDs, one in English, and one in another field.
I talked to her a little, tried to give her a reality check. I don't think it took, but that's okay.
Am I wrong, or does it sound really unlikely that a second PhD program would accept someone who already has a PhD? I can see doing a joint JD/PhD program or something. But I think a program would hesitate to accept someone who wants to switch fields after already earning a PhD. If the fields are close, then there's no point. And if they're far apart, then the change seems weird, as in what was the point of doing the first PhD if you don't want to work in that field?
I barely made it through my one PhD in one piece. I can't even imagine wanting to start another, all the stupid hoops, the power trips, the grad student nastiness. Nope. No thanks. (It's not that all grad students are nasty, but enough are to make grad seminars painful.)