Take a paper cup,plastic cup, or any cup u dont need and that no one knows u own.then,take water and fill the cup up about 1-2 thirds full with water. Then,think of the nastiest things and things that smell and stain.mix them in the cup together. And i mean the nastiest! You nead raw egg!that and water! if u run out of room in the cup, dont use water, but u need egg! Then, after u have the nasty stuff mixed together, put it in the freezer for a good day or so.Then, take it to the person u want revenge on or u want to just play a practical joke on and put the cup with the nasty ice upside down right in front of the door. Then, eventually, it will melt and there will be a nasty blob of whatever u used right infront of the door! The worst part is, when the person notices the cup, it only looks like a cup. The nasty stuff stays in the cup melted. When the pick it up, it will go all over the place! I used egg,water,jelly,dog food,olive,chocolate milk,dog crap, and a scoop of peanut butter. Dont use jelly! it messes it up. hope u enjoy!