With revival screenings, I've managed to see many, many films that could've been the answer to this (Once Upon a Time in the West, Lawrence of Arabia, the Errol Flynn Robin Hood, 2001, The Good, the Bad, and the Ugly, etc.). That said, I've failed so far to see on a big screen anything by Ray Harryhausen. It'd be neat to see Mysterious Island again, this time on a big screen, plus a big sound system for Bernard Herrman's thundering score to thunder out of. That's just one of many possible good examples.
Day 27 - Best pilot episode
Twin Peaks (MUCH better and more coherent, of course, than the show's finale). And wasn't it shown in theaters in Europe? It really does feel like a movie.