I'm also a spontaneous smoker. Because I recently went broke and smoked all my stash while recuperating from knee surgery all my smokes have been bought in the last few weeks and many are still recovering. That limits my selection somewhat. On top of that, I keep my smokes standing up so I can't see the bands and in no particular order. I just reach in a grab one and if it is deemed recovered, I say "hooray" and smoke it.
About as haphazard as you can get! It works for me because it fits my personality!