Something that breaks their concept of what is possible.
I can make a non-physical energy that about 90% of people can feel, some very acutely. Some as they walk by will notice!
While my method is technological, just unexplained by current science.
There are videos that show how to do it.
Try it and read the comments which shows it works for most everyone who comments.
Another thing is I would look into learning some tips from Landmark Education leaders, they can defiantly impact people, though they take longer.
One trick is addressing what the audience will think to things said, address their listening so they don’t zone out. Connect to their objections, fears and doubt to put them out of the way.