Demonstrative speech topics and speeches are judged more on their form and style of delivery rather than on their content.
To focus on your delivery, you need to feel confident about your topic. Having a certain amount of passion about the subject will help as well.
You can probably get a lot of excellent demonstration speech ideas by brainstorming your preferences. But don't forget to consider your audience and make sure you choose something that THEY would be interested in learning how to do.
You also need to be sure your idea is appropriate. For example, you would not want to deliver a speech on how to make a Spanish coffee to a group of AA members! It is essential to know the audience. I remember losing a speech contest in high school because I delivered a persuasive speech against the repeal of the 21st amendment to the U.S. Constitution that prohibited alcohol. My audience comprised veterans, most of whom very likely felt favorable toward freedom to choose about having a beer every so often. Oops! I realized my error too late.
Below are some lead-in phrases to trigger your imagination and help you come up with demonstrative speech topics. To use a lead-in, fill in the blank to complete the phrase. With the statement completed, that represents one idea for your next presentation. Complete each lead-in to come up with six different ideas.
If you are not satisfied with any of the initial ideas. Repeat using the lead-ins again, or try making each of these lead-ins the 2nd tier of a Mindmap. After drawing the initial map or using a software program such as Freemind, then add circles or blocks for each 2nd level lead-in to create a 3rd tier. You might dig even deeper to find creative ideas by adding 4th or even 5th levels. A linear map is provided after the lead-in samples that follow.
Example Linear Mindmap of a topic to narrow the focus more or discover a new idea:
Once you've chosen your topic, write in one sentence what it is you are going to be demonstrating to your audience and why you chose that particular topic.
If, for example, you've chosen to speak about Voice Over Internet Protocol (VOIP) then you might decide to start with:
Today I will be demonstrating how VOIP works. I believe it is critical to understand as this seems to be the wave of the future in telecommunications.
In a demonstration speech, you must use visual aids. If you don't, then it is not a demonstrative speech, but rather an informative one. You can use whatever visual support you like and more than one if it will help you to show exactly how to accomplish what you are demonstrating.
Staying with the VOIP topic, you could bring in a laptop and clearly show how to set up SKYPE, then demonstrate what you accomplished by having someone in the audience that you can call.
You could also use a power point presentation clearly outlining the steps to take, to walk your audience through each step.
The finishing touch on this VOIP speech could be summarizing your presentation while talking to the person you've planted in the audience to receive your call.
Better still, if appropriate, have someone from the audience come on stage and make the call. Audience involvement always makes for a more inspiring speech and delivering a "how to" speech as interactively as possible gives audience members a chance to learn 'hands on.'
Have fun with your next demonstrative speech!