There are different levels at which conversation in the cinema can be considered rude, but as a rule of thumb wed suggest you think about whether or not what you have to say is more crucial or entertaining than whats happening onscreen before opening your gob. A whispered comment or wisecrack to the moviegoing chum in the next seat is fine, but cast your oral net any further afield and youre in danger of seeming a right prat. Worse still are those audience members who act like theyve seen it all before and make broad pronouncements about the twists and turns the plots about to make, or whos going to get impaled by the bloodthirsty cannibals next. These people are the devil. Pray youre not one of them.