Of the twelve installments in the series, the propreantepenultimate is my favorite.
/ˌproʊpriˌæntipɛˈnʌltəmɪt/
adjective.
1. the fifth to last item in a series
"He really had to show off his vocabulary by telling me he wanted the 'propreantepenultimate' entry from that list... he knows it's faster to just say 'fifth-to-last', yes?"