At Migros Horgen, there are toilet paper dispensers from Franke in the men's toilet. These are designed to hold 2 rolls of paper. As soon as the bottom one is used up, the top one drops down and can be used. Of course, you need toilet rolls that are not too thick and fit into the dispenser. These are certainly available. Presumably a Migros thrifty person has now discovered that these rolls, which are not too thick, are more expensive than others, which also contain more paper and are therefore thicker. He quickly ordered these rolls and was delighted with the good purchase. Now these rolls are squeezed into the dispenser. They go in, but you can't get any more paper. As they say: Operation successful, patient dead...