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That wouldn’t work, the water would change the texture of the mentos before the soda hits it.
Ok ok, plan B then:
We freeze the end of a rope in ice that they unknowingly throw in their drink. The other end of the rope holds a bucket of water above the chair they sit in. Once the ice melts, the rope will slip out and the water will come down on them. They will never know what happened!
Put two ends of a cable under that person’s chair, once water comes down it will close the circuit, which will in turn cause a piano to fall on their head!
