Sayonara Boy!

A man in a white t-shirt stands in a dimly lit doorway, initially holding a small object to his mouth. He then reacts with a sudden, exaggerated expression of shock and fear, throwing his head back, opening his mouth wide, and flailing his arms outward. He repeats this sequence of a startled reaction and flailing movements throughout the loop. The setting appears to be a dark interior, possibly a kitchen or hallway, with a glass door or shower enclosure visible to the left.