a head chef stands at the cooking station, first smiling warmly while tasting a dish with a spoon. Within moments, his expression transforms completely to angry frustration as he throws his chef's hat down. The sudden mood shift happens without any clear reason or trigger. His face changes from satisfied to furious in an instant. The kitchen staff around him step back in confusion, exchanging worried glances. Some cooks pause their work to stare at the chef's unexpected outburst. someone being subject to sudden or unpredictable changes of mood or mind