A new jewelry store called "The Red Ruby" has just opened in Gotham - one that prides itself on selling nothing but the biggest, most extravagant rubies. Not surprisingly, the store has a large number of guards, alert and ready. One of the guards sees a sound-truck across the street, and goes over to check it out. The truck, at first, seems harmless - it merely offers free entertainment in the form of old, corny jokes. The first joke that tells is the classic "Road-Crossing Chicken" joke, which the passerby find enormously unfunny; when the punch line is given, however, the crowd surrounding the truck - the guards included - suddenly find themselves laughing without any control.