A cup of water, some dark liquid (like Rootbeer).
Have the scouts line up facing the audience. The first scout in the line pretends to drink some water while the last scout in line holds the dark liquid in their mouth. The first person in line pretends to spit the water into the next person's ear. Repeat this until it goes to the last person.
The last person will spit out the dark liquid like the water had been going through their ears.
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