The Bank of Canada has an easter egg on its website that features the iconic videogame code to promote its newest $10 bill.
If you go to their website and enter the Konami Code, the Canadian National Anthem will play and fill the screen with tiny animated bank notes!
The Konami code was first popularized in the video game Contra in 1987 and is used in tons of other games to reveal secrets or "easter eggs"/hidden references.
The infamous code is: up, up, down, down, left, right, left, right, B, and A!