Disposition Impossible
Daniel Nolan and I are working on a draft paper looking at unmanifestable dispositions: dispositions, that is, to PHI in circumstances C where at least one of PHI and C is impossible (logically, metaphysically and/or nomically). We think many things have such dispositions, and this isn’t trivial. (A trivialist would say that everything has every unmanifestable disposition.) And we think it matters. It turns out not to be easy for standard kinds of theories of dispositions to accommodate the unmanifestable sort.
You may enjoy this cartoon : http://www.slc.edu/magazine/mtm/media/images/cw_comics_nyer.jpg !