Story and Screenplay-
The Hangover-One of the best comedy film of all time. It is a movie about remembering the past incidents. Friends who always dream about having a nice party but never could enjoy it. Now, they have got a chance to fulfill their most cherished dream. But, they did some wild, bizarre shit on the day of their enjoyment and completely forgot about the party and what actually happened. So, the friends try their best to recollect the memory of their wildness. The concept is very unique. It is not a ha ha kind of movie. You, need to dive into the story. You need to feel the characters. The screenplay covers the journey of the friends. You feel that actually it is you who is taking this trip. Unique twist and turns in the screenplay made the movie very interesting. Every characters had something to do in the movie. You can point-out each of them by their weird way of behaving.
Acting-
Bradley Cooper played a school teacher in the movie. Ed Helms played a medical professional who is not very good communicator and does weird things when he is drunk. Zach Galifianakis is most loving character in the movie who is always in his own elements in the movie. He does weird things and thinks that doing those are completely fine. Thus he creates situational comedy. Ken Jeong plays a very interesting character in the movie. He is the surprise in the movie.
If you are looking for a good time without any tension, then you gotta watch this movie. It is a very uniquely written and directed comedy film.