Place a sheet of wax paper on a large baking sheet or on your counter.
In a large saucepan or Dutch oven, melt the butter over medium heat
When butter is melted, add the whole bag of marshmallows. Stir until melted completely. Remove pan from heat.
Get out the largest bowl you own and pour in the 10 cups of popcorn. Then pour the marshmallow mixture over the popcorn so that it totally coats the popcorn.
Divide the popcorn mixture in half, placing half in another bowl (doesn't have to be as large).
Mix in the candy corn in one half of the popcorn and the Reese's in the other.
Spray your hands with the non-stick spray (lightly).
Form the popcorn mixture into balls, the size is up to you. Press in some eyes all over the popcorn.
Let set on wax paper until cooled and firm. Enjoy!