1,000,000 10 kg gold coin from Canada.
I got an email earlier today from the Royal Canadian Mint about them coming out with one of these this year, and I can't find nothing about it, so this one's from some previous year (2007?) You'd think for a coin with a million dollar face value they would message you about it when it actually came out.
"Okay, I'll buy one, here's my money"
"Oh, we don't have any yet"
"That's okay, it's only money, I don't mind throwing it away on million dollar gold coins that don't even exist yet"