Before the program, Mark an x or whatever on the bottom of one of the plates, or pass around a roll of blue painters tape, tell everyone to "take a piece as long as they will need, they get to guess how much to take". No other information is to be given, and they can stick it to the table in front of them. After the program, walk around with a yardstick and measure each piece of tape. Your partner writes the name and length. Put two papers in a container of some kind, one says longest, the other says shortest. Let the oldest guild member draw one piece, and who ever had longest or shortest (which ever is drawn) gets the extra prize.