Methods, devices, and systems are described for bumping a mobile device, such as a smart phone, against a fixed poster board display at a store to initiate a download of coupons, advertisements, or other benefits to the mobile device. Products can be rated by a user's up/down bump or other bump patterns. Using accelerometer-based inertial measurements, multiple users can control multiple mouse cursors on a large display with their mobile devices in order to select information to be downloaded to their mobile devices. The multiple users can bump the display in order to select their items simultaneously.