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I'll start. Buy a bottle of coke, a strand of thin string (like dental flos) and
also some Mentos. You'll also need some sort of needle. Pierce a hole through the the Mentos so that you can tie the string through. Then open the coke bottle and place the Mentos and string at the top of the openend bottle. Then screw the bottle on tightly with the string hanging out. Finally cut the exposed string and wait. As soon as somebody opens the bottle the Mentos will fall in the coke. 10/10 would prank again.
