I cannnot take complete credit for this idea as I read it on a Auctioneer Forum, but it is certainly a new one on me!

Take 3 pies and have organization pick someone to set in a chair in front of everyone.Then the Auctioneer auctions the pie off for someone to pie the person sitting in the chair.After they are done the person that got pied can pick anyone they want out of the audience.Whoever they pick can buy their way out for a certain amount unless someone starts bidding against them and wins.
If the person doesn't want to pay they can get pie in their eye.This usually generates some extra money and a lot of fun.I've never laughed so hard at a Salvation army benefit.You can see a picture on the web site. http://www.almightyauctions.com. Try it they will love it. In fact someone from Hawaii heard about the Pie in your eye while on an airplane and the event was held in Montana.