Oh I had fun with this last year and will probably make a scary candy bag for years to come!
Step 1: Prepare the Bag
Simply roll down the top of a brown paper grocery bag and cut a 4" x 2" hole down near the bottom.
Step 2: Prepare the Sock
Take an old sock and cut the foot off and staple what is left of it to around the hole.
Step 3: Fill the Bag
Then fill the bag with the trick or treat candy.
Step 4: Scare Their Pants Off!
Put your hand thru the sock and when the little kiddies reach in to grab candy, you grab their sticky little hands! ah ha ha! I do not recommend doing this to the really young ones, I did manage to make one little girl cry last year.