Discussed in 'DogFood'
EatYourOwnDogFood refers to the practice of using the things you design, rather than just designing them for other people.
Judges have, several times, sentenced landlords to serve time living in their own buildings. (http://query.nytimes.com/gst/fullpage.html?res=9B0DE2DA1E3DF932A25754C0A961948260 - one example)