OK, I think I got the Cyril one down now. I JUST had a thought come in my head. I will have to try it a couple times to see, but here goes...
I think you could make a cut in a liquid type creamer ( gently so you don't spill it out) to make sort of a door.... are you with me? Would be three connected SMALL cuts. Then you attarch a magnet to that door. If the ring is also magnetic, then as you gently turn the cup, when the magnets attract it will pull that little door open. And there you have it.
