broomstick or long pole.
one long thread for each patrol
5 or 6 saltine crackers for each patrol

Tie a cracker to the end of a string by threading the thread through a hole in the cracker and tieing it.
Tie another cracker to the thread about 6 inches above the first.
Repeat for all crackers and then tie the thread to the broom.

This is a fun competition that takes just a minute or two but makes a big mess.

Call up a volunteer for each patrol. The rest of each patrol will be cheering on their scout.

Have two unbiased volunteers hold up the broomstick so the shortest scout will be able to reach the highest cracker with his mouth.
Have the scouts line up behind the broomstick, facing the audience. Have one scout lined up behind each string of crackers. Have each scout clasp his hands behind his back.

Objective: Using only your mouth, be the first scout to crack all your crackers off the string. You don't have to eat them, but the string needs to be completely clean.

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Alternative: Have each scout run up and crack one cracker on his patrol's string, then return and tag the next scout. This gets more scouts involved rather than watching.