It's halfway through the summer movie season, and there's a lot of hand-wringing about the state of the Tentpole Film — yes, in spite of Avengers. This year has seen some huge high-profile flops, plus some massive films that underperformed Stateside. And meanwhile, some of the biggest films in the pipeline are having well-publicized troubles, from Lone Ranger to World War Z.

The thing is, Hollywood already knows how to make blockbuster movies that make money — they've just forgotten some of the fundamentals in the rush to claim dates in the crowded summer schedules. Here are 10 rules that Hollywood knew, but has forgotten.