Hit them with 12ga birdshot.
It's on the house
Pressure washer with dish soap in the tank and a 0 degree nozzle. It's not as fun though.
When I was a kid my neighbor lost a bet with his brother. He had to stand under a hornet nest and fire the paintball gun straight up... He swole up like the Michelin man, and when their dad got home the other ended up looking fairly similar.
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