I have joke to share.

Some doughnuts are big but some are small, and each doughnut has a hole.
The bigger the doughnut is, the bigger the hole is. The smaller the doughnut is, the smaller the hole is.
The bigger the hole is, the smaller the doughnut is. The smaller the hole is, the bigger the doughnut is.
So the bigger the doughnut is, the smaller the doughnut is. The smaller the doughnut is, the bigger the doughnut is.

It seems interesting! But this is called stealing concept actually. The correct way of comparison is to measure the volume.