$6.50
A tricky optical illusion, place this fun puzzle somewhere conspicuous and stand back grinning as person after person tries their luck figuring it out.
Using only the 2 pieces get the cap of the mushroom to snap back to the base. NOTE: this is an optical illusion; the hook and the rubber band are purely to confuse what is actually happening. Presentation is everything.
YouTube video demonstration:
http://www.youtube.com/watch?v=tfoM7WLL5Ms
$9.50
Once the shape is unraveled, getting it back into a cube turns out to be much harder than it looks.
A 3 x 3 x 3 cube made up of 27 pieces linked together by a stretchy string.