The feeling of accomplishment that comes after a long day. When sure, you spent a good portion of your day stressed out, but the end result was totally worth it.
Accidentally daydreaming in Psych only to snap back to reality and realize that for the first time all term, you weren't paying complete attention and you didn't actually miss anything important.
Knowing that your hometown library system got the book you wanted and that it's waiting at home for you to read in your pyjamas on the couch with your dog as a pillow on your first weekend of break.
When even though you got your pride handed to you on a platter by a ten year old that beat you at chess because you weren't paying attention and got your queen killed off four moves into the game, the look on his face when he realizes he's winning makes losing entirely worth it.
When you find out that the most random people think you are amazing, and you really haven't got the faintest idea why, but decide to ponder it over a peach smoothie until your lack of anything resembling a high attention span kicks in and you start playing with something shiny instead... and it doesn't bother you any.
Thanksgiving and Thanksgiving break, and the way it feels to know that you are about to see the people you love most in the world.
Totally acing a performance and the absolute rush you get when you and your companions run off stage to the echoing screams and applause of the packed theatre.
And the best... absolutely best thing of the day that has to go to the Shire:
Realizing that you've just finished your term paper, and that you're probably going to get an A on it. And the split second that it occurs to you that you've got nine days of break in a day and a half and you don't have to think about your twenty-page research paper once during the entire time.
That's a good feeling.