The projector broke. Clearly Spock came in and tampered with it, devious Vulcan that he is.
So yes, 500 expectant Star Wars fans all sitting in the cinema ready to see this long-awaited film only to be told we can't. Lucky it didn't turn into a full scale riot.
It took them over an hour to reimburse everyone for their tickets. But on the up side they did give us all four of the collectable posters so I am now the proud owner of a Darth Vader poster that you're only supposed to get after you've seen the film five times. Yay me.
Ruined our streak of seeing them on the first day though.