Small metal box falling on wood
Metal tank falling out of a bus
Stone,rock or brick rubble debris falling with a dull crash
Small, light wooden object rattling, or falling and bouncing quickly. Two instances.
Penny dropping on plexiglass, skipping 1.
Penny falling on plexiglass and skipping 2.
Penny falling on plexiglass with a fast wobble.
Penny falling on plexiglass and wobbling fast 2.
Quarter falling on plexiglass and bouncing away.
Quarter dropping on plexiglass and skipping.