For only one day a year, Australians can play a betting game that's illegal in most parts of the country. 'Two-up' involves betting on whether you'll land on heads or tails when tossing a coin and the game is not allowed as it's classified as unregulated gambling. But on special occasions like Anzac Day on 25 April, it's legal to play the game for a few hours and people rush to the pub to get involved. Tap the link in @BBCNews's bio to read more about the game. #TwoUp #Australia #BBCNews