Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A mind contest

This is one of Smith's captivating acting. One scene is especially fond when a subway platform and an imaginary "timing-machine" generate a positive outlook to allay their predicament. This movie highlights on a man's assertive mind challenging the flux of his life. It is an adventurous encouraging movie---a pursuit, a process--in a reasonable pace, you don't find it sad at all.