They've been referencing the Die Hard movies. I had this concept for an LoTR crossover concept. See, some time after the events of LoTR, a couple of the hobbits are travelling again and they stop by Orthanc (now under non-evil management) at the same time as a tour group of kids from Minas Tirith, and these terrorist orcs have this plan to blow the place up with the kids and our heroes have to make their way to the terrorists' hideout high in the tower and stop them . . . it would be called: