You could write a speech about a variety of unusual, or atypical occupations. There are a host of military careers such as missile development or special forces operations that could be provocative and unique. You could also develop a speech about occupations in the carnival world. Many of the careers in the carnival world require unique physical traits as well as a rare ability to entertain.
The art of grilling is an interesting and informative topic; you can highlight various aspects of grilling. For instance, you could make a speech about the techniques involved in grilling only certain types of meat such as chicken or lamb. You could also discuss how various types of charcoal and wood produce different flavors and levels of cooking.
The entire U.S. Interstate Highway system is an unusual speech topic. You can discuss the planning and funding that were necessary to develop an intricate set of highways that connect one coast to the other. Mention the most notable figures responsible for constructing U.S. Interstate Highways, such as Dwight D. Eisenhower. Other influential figures could include politicians, engineers, and business tycoons. A complete speech will also draw attention to the opposition theconstruction of the U.S. Highway Interstate system faced.
Skyscrapers are unique to modern society; they have only been in existence for about 100 years. Develop a speech about the history of skyscrapers and their connection to the urban metropolis. Discuss the various materials used to make skyscrapers. In Asia, for instance, some skyscrapers are partially constructed from bamboo. You can take a variety of approaches to make a speech on skyscrapers, such as the engineering involved, function of, or artistic relevance.