Also common are anxiety, mood swings and severe aggression. Symptoms may include mental tension, irritability, mood swings, and crying spells. She suffered severe mood swings and later alcoholism and a stroke. His mood swings and unpredictable behavior had several sources. Her major mood swings are usually attributed to menopause. Butler was clinically bipolar and prone to mood swings. Examples include the swings of a pendulum clock, and the heartbeat while resting. The duration of mood swings also varies. Spring and fall are variable, prone to extremes in temperature and unpredictable swings in conditions. The basic damped horizontal pendulum seismometer swings like the gate of a fence. As a child, Murphy was a loner with mood swings and an explosive temper. He then swings it again and knocks off the Gladiator's helmet. Viserys is an arrogant, cruel and ambitious man given to violent mood swings. His stroke technique was based on quick shoulder turns, true swings, and accurate timing. He swings a third time, and slashes the chest.