hide the motor oil. if we get dust and lint in their parts we can slow them down enough to get refrigerator magnates on them.
We can kiss our environment good bye also. They wont need clean air to breath. Or be able to take in a nice sun rise or sun set.
We could use them to explore space. and just by accadent (you know how us humans make mistakes always) just send them off to the wrong planet that might just be really close to the sun where they might melt.
Who knows how theses things happan. Damn human error. I'm just saying.
http://news.bbc.co.uk/2/hi/technology/6200005.stm