just take the outside packaging off the mentos, and leave the sliver wrapping on. this keeps them in a nice straight line, and easily lowere into the bottle. lower it as close as possible to the top of the actual coke, and then quickle push them down, while someone else stands very close with the lid. screw the lid on the second after the top mentos clears the opening of the bottle. shake the **** out of it, realease the cap till its about to blow off then throw the bastard at the ground. if your lucky it will go 50m in the air.