Minecraft 1.4.5, Snapshot 12w50a, Snapshot 12w50b, Minecraft 1.4.6
Power redstone lamps via redstone and a lever. Turn the lamps on, and shoot a flaming arrow in them. When you turn the signal off, the arrow will fall a notch downwards when they should stick in and not move.
MC-3352 Arrows fired into a repeater / comparator / jukebox / command block / hopper / daylight sensor that is updating will play the arrow hitting a block noise