Glee Gum's Make Your Own Chewing Gum kit. "And it's really easy: Soften the chicle gum base, either in the microwave or on the stove. Then you add the sugar, corn syrup, and the flavor packets, knead it a little, and WOW! You've made your own gum!" $10 gets you enough to make 50 pieces, refills are $6. [via kottke.org]