As they near the end of their adventure, they realize that their bond is stronger than ever and that their Tamil dubbed film marathon has become an integral part of their friendship.
This is a controversial question. The first film is a classic. The second is a remake (literally) of the first but set in Bangkok. However, The Hangover 3 stands alone because it breaks the formula.
Avoid random "uploader" websites. The top quality is only found on official platforms. Fan-made dubs often have terrible audio sync and crude translations that ruin the comedy.
: A reliable source for purchasing dubbed Hollywood hits in India. Quick Movie Guide