Step 1: Get Some Stuff.
Container: I used plastic popcorn containers I found at Target for $1 apiece. You can also get cardboard ones in packs for much cheaper.
Popcorn: Chips/peanuts work if your friends don't like popcorn.
Soda: If you have Mormon or health-nut friends, try bottles of juice or something.
Candy: Health-nuts can have toasted almonds, sunflower seeds, etc. It's recommended that they fit in the container.
Movie rental pass: I got mine at Blockbuster for about $5.