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.