This boy sure knows how to express his unhappiness. First he screws up his face and then the wail starts. Then he plummets to the ground with a full cry. He may roll over and pause the tantrum to see if mommy is watching or concerned. Next step is rolling back over and continued crying. 10 seconds later he staggers back up and is back to normal. It's quite amusing and always evokes a throaty chuckle from me.