Sodaplay

I'd forgotten just how good sodaconstructor is for whiling away a lunchtime. It takes a little while to get used to the interface, but it's a great little toy once you get the hang of it.
You can create your own wireframe creature and teach it to walk!
Or just load up a pre-made millipede, and increase the gravity in it's little wireframe world until it's little legs buckle and break under it's own weight!
It's fun, and it is actually quite educational. I had to recall my civil engineering training to design a fun little wireframe demolition ball crane. My Structural Analysis lecturer would be SO proud.