Flat soda switch out

When your soft drink sitting out is flat
Should you be upset by that?
Tell me what the standard is
With soda pops that lose their fiz.

Too often I’ve made the two-can mistake,
Left one out and grabbed another.
When concentration is allowed to break,
I go for one, then grab the other.

For me it’s the same feeling I get
When I drink milk but some how think
I should be tasting OJ and yet
I’m holding a completely different drink.