Pie in the Face
Ask around your school and community for volunteers, 5 is a good number. Get someone of importance to receive the pie. Some examples are the Superintendent of a school, Principal, Football coach or even the Police Chief. Set a fundraising target. Get people to donate funds to see the volunteer(s) to receive the pie in the face. This is really fun and funny for kids and can be a great laugh for the parents as well!
Up the ante by having milestones such as for every 25$ raised the FUNraisers will pie the volunteer in the face. 125$ equals 5 pie smashings.