You can do even better and make a shape that fits perfectly in a square hole, round hole and triangular hole. See this clip for the excellent TV show QI
http://www.youtube.com/watch?v=6fUplOcay7E
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...and triangular hole
You can do even better and make a shape that fits perfectly in a square hole, round hole and triangular hole. See this clip for the excellent TV show QI
http://www.youtube.com/watch?v=6fUplOcay7E