The worlds biggest gold coin, weighing in at 1,012Kgs, has been minted in Australia. http://www.abc.net.au/news/2011-10-27/one-tonne-coin/3604466 Just thought I'd share EDIT: Here is some more info on it, including a video about it being made: http://www.1tonnegoldcoin.com/
Would it still be a coin even though it is cast? In the movie it said it was legal tender... just imagine spending it somewhere.
trying to one-up the Royal Canadian Mint's 100kg Maple Leaf, are we? Also reminded of this Mark Twain story: http://en.wikipedia.org/wiki/The_Million_Pound_Bank_Note