You get 5 different types of candy bars the minis work best and the same number of tiny diapers. Write 1-5 on the diapers in permanent marker then smoosh one type of candy bar per daiper inside (make sure to write down which is which) then take them all and melt them in the microwave. After that pass them out to guests and let them smell taste or touch and attempt to guess what kind is what by writing down the answers and after read the correct answers and see who got the most. Usually just one person out of 20 or so will get them all right. Its always a lot of fun and you can usually get embarrasing pics of people leaning in to examine the diapers.