Playing mall ninja with it, I deck myself out in full tactical gear and sneak around the house giving it the full run through. Gotta make sure that it's intimately familiar with it's new home. When I come across a mirror I stop and stare at it for 20 minutes or so thinking about how much of a bada$$ the gun makes me look, and how much skill and knowledge I've obtained by making my new purchase as well as playing Call of Duty.....
Or I just sit back and take it down for the first time, reassemble and pop in some snap caps to get some dry fire in while at my desk watching people shoot it on YouTube. Yeah lets go with that as my favorite part, aside from the obvious shooting portion.