Bring 2 or 3 guy/girl teams up front (works great with dating couples). Have each guy kneel in front of a girl and try to talk her out of putting a pie in his face. Clue each girl ahead of time to let him go for a while.
Get the audience to egg each girl on.
Also, see Pie Roulette (Click Here).
Jonathan McKee is the author of over twenty books including the brand new The Guy's Guide to FOUR BATTLES Every Young Man Must Face; The Teen’s Guide to Social Media & Mobile Devices; If I Had a Parenting Do Over; and the Amazon Best Seller - The Guy's Guide to God, Girls and the Phone in Your Pocket. He speaks to parents and leaders worldwide, all while providing free resources for youth workers on TheSource4YM.com. Jonathan, his wife Lori, and their three kids live in California.