Waiting not so patiently

I ordered the yarn for my sweater last Friday.  I've been sitting on my hands all week to keep them from starting a new project before I can start my sweater.  I've been obsessing all week about the design, playing with the length, size, and gauge in my knitting software.  I've made so many changes that it won't turn out to be the same sweater as the original pattern.  I'm itching to get started, so how can I possibly go to work today when my yarn will be delivered sometime today?  Maybe I should call in with the knitty flu.  Somehow I don't think they'll believe me.