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TattsLotto and the MCG
The chances of winning Tattslotto are about 1 in 8 million. A similar propability is obtained by placing a circular disc of diameter about 6 centimeters on the playing field of the MCG (which has area about 20,000 square meters): then imagine throwing a dart, which hits a random spot on the field, and see if it has hit the disc.
You can download our poster representing this scenario here (PDF - 4MB). If you zoom in at the point of the dart, you can see the disc (and the disc should just appear if the poster is printed on A0 paper).
For Oz Lotto, the chances of winning are about 1 in 45 million: then the disc should be about 2.5 cm, about the size of a 10 cent coin.