Fun size is the contrast to king size. Where king size is larger than the regular size (as a king would have), fun size is misnamed. Fun size is the term given to candy that is about 1/4 the size of regular units. These smaller candies are created by many companies, including M&M / Mars and Nestle. These products tend to be seen more around the time of Halloween. The sad thing is that there are even smaller candies than fun sized candies. These candies are bite size and are about half the size (if not even less) of fun size candies. All fun size and bite size candies are not labeled for individual retail sale and tend not to have nutrition facts printed on them.