Here is the video of PK,3Idiots and Munnabhai Director-Writer duo Rajkumar Hirani,Abhaji discusses their story techniques.
They pointed out really good valid statements.
1,Story or thought can be processed from outrage (Anger on someone or something) or memorabal incident.
2.Its good to have a Thought Folder. can put all ideas from your mind and put somewhere to develope gradually .
3.So many strories have their high and low points because they write with certain templates ,so write every scene with a beginning,middle and end .
4.There is no need of plot points or acts if you are really good at engaging your audience.
5.Some times too much logic can disengage audience from emotions , if you try to write every scene with a logic