Over at NLM (now under new management) there is a fun entry about the baculus cantoralis.
The cliffnotes version:
The Baculus Cantoralis, to give it one of its many names, is a large staff held by a Choirmaster or Cantor which originates in Benedictine Monasteries of the 10th and 11th centuries. It is sometimes called a Baculus Choralis or a Baculus Praecentoris. At Solesmes, where it is still in use, it is referred to as Le Bâton de Chantre.
Now it is a ceremonial object, but once it was used to correct errant singers.
How often I have wanted something like a liturgical paintball gun when some singer on the other side of the sanctuary was drifting flat or ignoring proper dymanics.
Go to NLM to read the whole thing and see spiffy photos.