Where to start on Bollywood? The place is full of clichés, stereotypes and formulas that have been used by uninspired film makers for generations. Every year hundreds of movies come out and most if not all follow certain rules that are sacrosanct in the film industry. Those movies that try to break these rules don’t break any box office records. No matter how much you hate it, the truth is that these rules of commercial cinema exist because they work. Not every producer wants to make a movie that is different or spreads a message in the society. Most of them want to make money and for that you have to stick to the rules. There are many such rules that must be followed to produce a hit but here are some default cardinal rules without which Hindi movies are practically unimaginable.