Filling multiple balloons with water.
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Previously:
https://www.homemadetools.net/forum/...880#post129305
https://www.homemadetools.net/forum/...059#post134185
https://www.homemadetools.net/forum/...804#post186672
https://www.homemadetools.net/forum/...410#post177449
https://www.homemadetools.net/forum/...851#post140386