I am SO jealous for you!! I remember the anticipation and excitement surrounding my 'new arrival'. It's been since March when I got my D800 and although some of the excitement has gone (10,000 clicks so far) I am still having a lot of fun with the camera and sometimes do as you did and just start shootings things around the house to 'play' a little. It really is a great feeling ...and I am sure that like me and others, you will be 'giddy' about the D800 for some time to come. There are so many things that it can do....and do VERY WELL. I reenergized myself with my recent purchase of the V1 with the FT1 adapter to use my existing AF-S lenses. Shooting at 500-1377mm is only one more thing I can experiment with now.
I hope you (we) never lose the 'fun factor' with this camera
PS: you said you have cats (we do too) but what's with the 'horse' picture? Was it just a good pic or do you raise/train them?
Dan (Nikon D800,V2,Sony HX400V,Lumix ZS40) "I don't read, I just look at pictures" - Andy Warhol