Algodoo

With this thing you can exterminate any thing that collides with it.

To put the "X" in "Killer Mode" push "q" single.
To get back it to "Normal Mode" push "e" single.

Note: This thing has made on Phun5.28 with some scripting code implemented on the phunlet.
If you overwrite it, it may stop working ...

Note2: It's absolutely Impossible yo get survive with this thing. Don't think, you CAN'T stop it's attack.
The only thing that you can do is Don't collide with it.