Computer games
Restaurant City
In an online game Restaurant City you can build your own restaurant and decorate it on your own discretion. Some players created impossible constructions in their restaurants. The game has some social features and you can play it on Facebook. The original link for the game is http://www.playfish.com/?page=game_restaurant
Below, you can see some screenshots of impossible restaurants. The most remarkable is the first one with Escher's Waterfall.