Jiffypop... as I understand, you have to constantly shake that? But perfect for a campfire, even on your deck.
Popcorn balls are fun, too. Just make a big batch of popcorn, pour a bag of melted marshmallows over them, butter up your hands so you can shape it into balls. Roll in mini chocolate or butterscotch chips. I make Christmas ones by rolling them in crushed candycanes, not mint-flavored, the cherry/grape/banana flavored.
i remember when my momma made popcorn balls for my 12th birthday slumber party!