Speaking about what a person knows best often make the best speech topics and typically that encompasses job experience, both past and present. Speaking about job responsibilities, professional and educational requirements, extra training and walking people through a daily routine can often make a simple impromptu speech exciting and interesting. In a sense, speakers should think about it as recounting a resume -- a speech that can take just a few minutes. Speeches can also include the current job climate and what the future holds for people employed in this profession as well as ethical issues or unemployment figures.
Storytelling can take so many forms, but in the context of an impromptu speech, a speaker should think about past events that made him a better person, allowed him to become closer to a family member or experience something that only a few get to experience. While the speech can cover just about anything, speakers should detail characters, plot, setting and conflict just like a normal storybook. Giving an audience descriptive visuals also make the story better. People enjoy listening to brushes with celebrities and greatness, places that people normally don't visit and awkward situations that turn out with a funny ending.
People who know current events thoroughly can spend a few minutes recanting items read in newspapers, magazines and events seen on television. Speaking about these topics allows a speaker to compare and contrast ideas, address what she likes and doesn't like about a particular policy or shocking and disturbing video. A speaker can also address editorials heard on radio talk shows and those that appear in the newspaper. Offering opinions on current events can get tricky, typically if the audience does not approve; a speaker should know who is in the crowd.
Speaking about personal struggles, regardless of the topic can often inspire or motivate a crowd at any given moment. Telling people about the struggle to lose weight, find a better job, battle a horrible disease or overcome an addiction can walk people through the steps it took to correct the action and make life better. These types of impromptu speeches often work best with a crowd that knows of these struggles and may sympathize with the speaker. Those listening also might it comforting to know that the person giving the speech also went through the same thing. While talking about the struggles, speakers should add language that uses encouraging and uplifting words.