This year's prize at the SUMS Conference (http://www.jmu.edu/mathstat/sums) is a lot of jawbreakers trapped inside a 3D-printed icosahedron, symbol for the Mathematical Association of America (http://www.maa.org).
Print as a "shell" and drop in the candy before the top closes up. Make people guess how many are inside! People have to decide when/how to destroy or break the model to get at the jawbreakers.
Featured on Day 32 of MakerHome: http://makerhome.blogspot.com/2013/09/day-32-icosahedron-jawbreaker-trap.html
Hacktastic blog: mathgrrl.com/hacktastic
Shapeways geekhaus store: shapeways.com/shops/mathgrrl
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