What is more commenly known as a catering truck or a lunch truck. They go around visiting all the office buildings in the area around lunch time. They are know to sell greasy fried foods, prepackaged snacks, fruit, sandwiches, and just about any kind of drink you can imagine. They usually make themselves known with one of those horns that plays the little song. Ironically, the one that comes to where I work plays La Cucaracha to announce their arrival.