Finding A Speech Subject

When travelling to another group, whether it is a different school, business town or country, how do you find a subject which will interest your audience?
1 What interests do you share with people you work with, your family, friends, or neighbours?
2 What is different about you - causes raised eyebrows from your work colleagues, family friends and neighbours?  What do you do which annoys them? What do they do which annoys you? For example, if you are on time, but your children or spouse is always late, you can do a serious speech on being on time, getting jobs or contracts because you delivered on time, or a humorous speech on the missed planes, and nearly missed weddings and funerals.
3 Who have you met in the last 24 hours who was exactly the same as you, or totally different?
Now you know what makes you typical, or unique.
Either of these will make a great speech.
Try both and see which gets the reaction, 'tonight's speech was OK but it wasn't as good as that wonderful speech you gave last month on ....' or,  'this was your best speech ever'. Now you know what is your speciality, presented with skill and verve.