Comets are essentially dirty snowballs, but lets build an ice-cream ball with our own eatable dirt.
Put your wafers inside the plastic bag, push out the air, and seal the top. Roll it with the rolling pin to make your dirt. Poor you dirt onto the wax paper and then roll a scoop of ice cream in it until it is completely covered with crumbs. Then take the comet and place it in a paper cupcake cup and put it in the freezer for 20 minutes. Remove the comet from the freezer and place it on your ice cream cone.