Flying Time

Why does time fly by so fast when you want it to the least? This past week was spring break and I feel like I blinked and the week was over. That was literally the fastest week of my life and now I have to start class again tonight. The week before last was possibly the longest week of my life because I couldnt wait for spring break to start. Einstein was trying to describe his theory of relativity one day and when describing the relative-ness (?) of time said (and I paraphrase) "When you are taking a math test, time will go by slowly. But when you are talking to a girl, time will fly by."