I paint Malphite to look like a giant diamond and Taric falls in love with him.
We replace Ahri's entire wardrobe while she's in the bath with a Japanese school swimsuit so its the only thing she has to wear in pubic.
When he's asleep, reprogram Viktor's third arm so it vulcan nerve pinches him whenever he says the phrase 'Glorious Evolution'
Tip Alistar over while he's sleeping.
Replace Teemo's mushrooms with neon paint and put a trigger on the bottom of them so when he puts it on the ground he is bright pink!
Switch Garen and Lux's underwear.
Record their reactions.
Replace Gragas' alcohol with water with food coloring in it. See how well his abilities work then.
"Exploding Cask no explode?"
Steal all of Taric's gems. Glue them on Morde's armor.
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