Which movies impressed you when it comes to manipulation of time?

Some movies use the straight narrative, telling the story from beginning to end. Some movies deviate, using flashbacks for possibly more dramatic impact. Some filmmakers, like Hitchcock and Tarantino manipulated time frames liberally, showing two scenes at the same time in split screen or jumping from present to the future then back into the past or middle part of the story.

So which movies made quite an impression to you in terms of time use?