If anyone else is interested in robotics but has trouble with the hardware costs, check this out:
http://www.gazebosim.org/wiki/Gazebo
Found it while looking for alternatives to a commercial app called V-REP, which you have to ask for the price of...
Does it instruct users on how to avoid stuff like this?
http://www.youtube.com/watch?v=xWMkOwq2qIU
Should be fine as long as you don't add animals or poop to the simulation. That can also help avoid this: 
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