I dreamed I'd bought a second-hand electric guitar (it was a Gibson SG copy in a weird gun-metal grey finish). When I got it home, it turned out to be a fat-body acoustic, with eight strings - not doubled, just eight strings instead of six.

Is there such a beast, and what would you tune it to?

(I don't even play the guitar, although I have been thinking for a while I ought to learn a few chords.)