Every thing is beautiful in the world if it is seen with beautyful eyes in a beautiful way.Every person enjoy excitement in a different way. It depends peronal internal and external environment. For many friends are the source of excitement. For husband, wife excites him. For a young boy, a girl may excite her. for a small kid, toys or videos may be source of excitement.So there is no perfect answer for this.Excitement levels are different for different ages. For me, my friendas are source of excitement.