Battle of the lungs!
You will need a length of plastic tube about 1.2m long preferably clear and with a minimum of 18mm bore.
One raw egg and a funnel.
Get your two volunteers and tell them it is a battle of strength, then produce the tube and funnel and crack the egg so it slides into the middle of the tube.
Then get each person to put one end of the tube in his or her mouths and on the whistle blow.
The one, who stops blowing first loses and gets the raw egg, normally the egg goes flying as they try and get out the way.
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