Replace all liquids with Sprite. This might sound like a favor at first, but think; EVERYTHING.
Emtpy milk and juice cartons, fill em with Sprite. Empty cologne and deoderants, replace contents with Sprite. Cough syrup? Replace with sprite. mix their toothpaste with sprite. Mix shampoo bottle with sprite. All liquids in the house.
Because sprite makes shit way more disgusting and sticky than other sodas. Mountain Dew also works.
You should probably keep a stock of non-contaminated liquids hidden for yourself though.
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