Mix all but Demerara rum and mint with ice and give a brief shake. Pour over crushed ice in a Collins and swizzle. Top with more ice and mint sprig. Pour burning Lemon Hart 151 over mint sprig to create Spindletop oil gusher (it should extinguish shortly). Serve with straw.
A swizzled Corn 'n' Oil with extra oil, named for Texas' Spindletop oil field. Garnish inspired by Kirk Estopinal's Vellocet: http://cocktailvirgin.blogspot.com/2012/11/the-vellocet.html . Aperol Falernum via: http://postprohibition.com/diy/aperol-falernum/ .