As any physicist will tell you, the fourth dimention is time
Which means that technically, films with a nonlinear narrative (especially Momento) or any film based around time-travel could be marketed as a '4D' film.
(
User #86772,
Fri 30 Sep 2011, 18:03,
archived)
..
Yeah but 5D sounds cooler. 5D, fuck yeah!!!!
(
Drew Badly Fiction section,
Fri 30 Sep 2011, 18:11,
archived)