A week or two ago, I ordered a Diet Coke and was given a root beer. (I was eating hot wings, so didn't NOTICE until I was most of the way through my drink.) Definitely feel your frustration.

I'd love to switch from soda to tea, but I live in the south, where "Sweet tea" (which I can't stand the flavor of) is the norm. Have to fight to get my regular iced tea, and often the bin has been contaminated with sugared-tea. I can taste it, but because it's not as sweet as "Sweet tea". At least with sodas, I know some careless teen hasn't emptied the wrong stuff into the wrong dispenser.