A free program for Android, by AFapps.de.

Money Radar Detector Simulated is a free prank app for Android phones that lets you pretend to find money on the street. It simulates the way a radar screen would work, showing you the notes and coins in the world as dots on the screen.

The app does not work like a real radar detector but like a video game. You can move the device around to locate the dots on the screen. It works for all types of currencies, including dollars, euros, and the Japanese yen.