Real crowd pleaser, pops out with a fun little noise.
Considered a puzzle but I usually just show people what it's about before handing it to them.
http://youtu.be/8RUr8m1OZLI
One version is like in the video, with or without magnet holes.
The flat version is something I saw here, and it's also cool:
http://www.grand-illusions.com/acatalog/Raketti.html
If you print it and love it, please do upload a Make and consider tipping! :)