At the high school level, students generally compete by grade level in events such as the spirit days, parade floats, and powder puff football . The competition at the collegiate level is mainly between Greek-letter organizations and, to a lesser degree, residence halls. At most larger schools, fraternities and sororities compete on parade floats, house decorations, skits, talent competitions, and even service events such as blood drives or food drives. Sometimes on coronation night, some schools have games that they play between classes. Such events include the pyramid, the 3 legged race, the pop chug, and tug of war.