“Sodaconstructor is a construction kit for interactive creations using masses and springs. By altering physical properties like gravity, friction, and speed, curiously anthropomorphic models can be made to walk, climb, wriggle, jiggle, or collapse into a writhing heap.”

Or, like me, you can spend many happy hours drawing boxes in 3D, flinging them into the air with your mouse, and after their sad collapse, hold a little 2D mariachi funeral.

Link