Ice cream vans are often brightly decorated and carry images of ice cream, or some other adornment, such as cartoon characters. They may have painted-on notices, which can serve a commercial purpose ("Stop me and buy one!") or a more serious one ("Watch that child!") - serving as a warning to passing motorists that children may run out into the road at the sight of the van, or appear without warning from behind it. Along the sides, a large sliding window acts as a serving hatch, and this is often covered with small pictures of the available products, with their associated prices. A distinctive feature of ice cream vans is their melodic chimes, and often these take the form of a famous and recognizable tune, usually "Turkey in the Straw", "The Entertainer," "Music Box Dancer", or "Camptown