Anyone with children knows the following job states: a balloon with a postcard that bears can get your address and then wait until the Finder provides the card with a unique address and unleashing. The post tells you where the balloon is flown.
And You will not guess: even sure there is now an app. Balloons are available in two versions on the App Store: the Full for $2.99 or free Lite Version. I once downloaded the Lite version on my iPhone. The whole thing just seems to be:
1. Choose a balloon
2. Add photo and message
3. Send up the balloon and wait curious to see who finds him and how far it flies.