If you have passed the paranoia level, pause the game and hit "restart from layer." Click paranoia, ok, and start the level. In the paranoia (second layer) layer, there are six rubber ducks like this
1 2
3 4
5 6
It is extremely easy to get as there are also no enemies near them. The only hard part about this is getting it to spawn. Just don't collect the required amount of eyeballs needed before getting this. If you do get on to the next stage, restart this process until you get it.