At the Mickelson ExxonMobile Teachers Academy, Phil explains how math and statistics help him practice his golf game. I saw this on the blog of Steven Diaz from Florida, called "Be Aware Math is Everywhere!"
The first part is a little quiet as there is a question from the audience (if you have cool video skills you could probably kill this part).
For folks who like projects that take them out of the classroom, an hour collecting data on the putting green might be cool. Pick a few distances like 3, 6, 9, 12, and 15 ft (that may be a real low percentage for the general public) and have each kid put once (or twice if you need more data) and then make a curve showing what percentage of the students hit each distance. Now do your analysis and curve fitting.