Why was the box delivered to Moneykandan in the first place? Actually, the box was supposed to be delivered to someone in flat number F6, but it gets delivered to E6 (after a cricket ball hits the E and it breaks and become an F). That's our first accident. When two men come searching for the box and break into Money's house, it leads to the second accident. The third accident happens when two more men come searching for the first two men. One accident leads to another and it eventually leads to one big accident in the climax.
I haven't seen a better Tamil film in the recent past that managed to use a single point of reference (the accidents) so effectively to narrate a story. Even though it doesn't have an impressive story, it manages to keep us hooked with its quirky narration, at least partly. It is engaging because it's as short (118 mins) as its contemporaries (all recent dark comedies in Tamil were under two hours), and therefore, never leaves room for a dull moment and even when you feel one, it's gone even before you realize it.