Horu

I get the point of stocking up. But say I have a 20oz Dr Pepper in my fridge and I go to the store to buy a 20oz Dr Pepper only to go back home and drink the one that I just bought. (This is more the discussion that we were in)

Again, not sure what the dilemma is here. If you feel like buying the same drink and drinking that instead of the one you already have in the fridge, then that's your decision, but you don't have to if you find it unnecessary. I have no reason to explain to you why you would in the first place, nor why you should.

Yeah. It's just one of those odd things that people do. But I have done it too and I often ask what purpose did this particular action serve and what made the drink in the fridge so damn special.