And then there's this...
Just before anyone goes thinking that I am some infallible domestic goddess (those who've tried my burned and salty chili can attest to the fact that I am not), this is what happened when I tried to make old-fashioned chocolate fudge. The fudge was setting as I was pouring it out of the pan. The butter fudge I made earlier behaved similarly, but not to this extreme.
I'm either going to have to never use this recipe again, or figure out what I was doing "wrong".