Triples are most definitely aloud, I was hoping some one had a 5 bill, as there were a few here in the U.K. So there must have been some in the States.
I remember an all night Kung-fu show with 5 films, An all night Horror fest again showing 5 films. There was the Ape-athon, where all the planet of the Apes films were shown in one go. Also a special showing of all the Star wars films in order finishing with the new ( at the time ) episode 3...