An example of a well designed core message by Simon Sinek. His big idea: 'Start with Why'
Three examples of a catchy start: an anecdote by Ernesto Sirolli, a case-study/example by Margaret Heffernan and a question plus interesting statistic by Robert Ballard.
The whole TEDtalk of Bryan Stevenson exists of three stories.
Stories and examples are a strong anchor for your audience to remember the facts and figures.
A lesser used but very powerful tool is a prop. Bill Gates creates a STAR moment, Something They will Always Remember.