I'd be fine with either without movie clips. Well done comic art in the style of Zombie Yeti or Zornow Must Be Destroyed would actually be my preference. I'm not one of those dying for either theme, but of the two, Back to the Future would be my choice. If they could get sound clips from the movies, plus Christopher Lloyd doing some custom callouts that would be pretty amazing. I picture shooting shots to build a counter up to 88 mile per hour in order to start the modes.