What do you do when you find out your manuscript is rejected?

Do any you have rejection rituals you go through when you get one of those big, fat NOs?

Edited to add – this question isn’t because I have just been rejected. I’m working on a talk where I want to speak about rejection and since I haven’t submitted anything new for a few years, I’m more distant than I used to be from the feeling. Of course if I hurry up and get the proposal done and to my agent I’m sure I’ll get to experience the feeling again very soon.