Well they're right, you can't undrink the things you've drunk and now you can't undrink that one XD You seem to luck out and always manage to end on a good note whenever you have one that doesn't work out. Though I suppose if you ended on the bad one you could always just drink more of the good one to make up for it.
Perhaps subconsciously I choose the order based on which one I think looks the best. I am usually quite gutted if the last one is mince!