[Richard]

I can never drink more than a couple of the same spirit(+mix) in one go. That is, I can drink a vodka-orange then a vodka-RedBull then a vodka-strawberry-juice, etc. (x2 if needbe) but I have to constantly change flavour.

Gets hopelessly boring and eventually stops going down if I don't vary it. I generally get closest to being sick \ hungover if I just drink cider - for the obvious reason that it's far more of a dehydrant than spirit-mixes.