Clown Travel Agency is a website created as part of the viral marketing campaign for the Batman movie, The Dark Knight. The website consists of an interactive image of a stained suitcase with stickers on it from around the world. Underneath the suitcase is an enveloped marked: "Departure Date 4-01," coinciding with the release of the website, and the beginning of this phase of the marketing campaign.
When users click on the papers that stick out of the envelope, a cryptic message pops up which, when clicked, displays a list of addresses around the world. The addresses are accompanied by a series of numbers. The list disappears soon after the addresses are displayed and reveals a final message with instructions directing them to another website, presumably another part of the marketing campaign.