Scratch

Look carefully... how many cats do you see? OR should I say how many DRAGGABLE cats do you see? I see 3, and you?
Yes, there are 3 cats on the screen that can drag to anywere, but suprisingly, one script, one SPRITE!

But how does it work?
Simple. Each cat has it's own list wich you can see on the screen, containing 2 values. 1. X pos, 2. Y pos. ONE sprite each time go to that possitions and stamp, reapeating 3 times. When you click and drag a cat, new possitions are assinged to the list. Simple, indeed ! 

Please enjoy, and learn!
Comments wont kill you! XD

http://scratch.mit.edu/projects/HamsterMan2000/808725