... and you get back your last paper with a note to please correct the crap you've written asap
... and you ride home crying and thus don't notice that your bike gets in the rails and crash down
... and break your bike
... and your laptop.
And then you get home and all you really want is to go to bed and never wake up. And you check your mails and find notifications that some friends thought of you and sent you silly facebook applications to wish you a nice day.
And you know that even if your day sucks, life doesn't :)