Tabletop Catapult

I spotted a wooden ruler sticking out from a stack of magazines on the coffee table. Instant ramp opportunity. I hauled a heavy green eraser onto the lower end to anchor it down, then tested the flex with my foot. Solid. I took three quick strides, jumped onto the cantilevered tip, and let the snap fly! The wood cracked against the table, rocketing a loose white bottle cap straight across the polished wood like a hockey puck. Landed right beside the coaster. Perfect trajectory on the first launch.