"If Only The Rest Of This Movie Was As Good As The First Half Hour"

Lots of movies put their best foot forward at the beginning. Especially lately, a lot of movies have had a terrific opening act, followed by a weaker second act and a terrible third act. Which movie do you wish was as good as its first 20-30 minutes?

Please include a picture, poster or clip for your chosen film. And please mention the title, and what was so good about the first half hour. And please remember to be excellent to each other.

Top image: The Wolverine. Everything up until he loses the shaggy hair and beard is brilliant. The first half hour of this movie is my favorite movie ever. After that... it starts to go downhill.