Room for Cream?

I've noticed no matter my response to "room for cream", I get served the same amount of coffee.  This isn't just one place either, it's almost as though everywhere I go I often get a full mug or cup of coffee whether I ask for room for cream or not.  I don't always get cream in my coffee, in fact I more often don't get cream, so I would notice the difference.  What's odd is that it's not a weird picky thing and I almost never bring it up, they do.  Same amount of coffee no matter what.  I have no contempt for the coffee people or anything, it's just an observation and results in a miniature social experiment.  Because, what does one do? 

For me, the solution is simple, I just don't put cream in the cases where the cup is too full for cream.  Otherwise, I'll fill it too full and do the thing where it gushes out of the top of my mug when I put the lid on, or else it will spill out the drink spout with the slightest bump.  The other solution is to ask them to dump some out but then you run the risk of being an ass in their view, regardless of your lack of fault.  I can detect an eye roll even if there is no actual eye movement.  Yet another alternative is to walk over to the cream and sugar area and dump some out into the trash.  That's just wrong because I know what a pain it is to empty trash with a bunch of liquid in it.  That happened a lot when I was working in a restaurant. 

So what else is there?  What do you do?