V is for: Vibraslap
We actually did have one of these when I was in high school band. As I'm sure you can imagine, it was highly ranked on the easy-instruments-to-make-fun-of list. It's usually played by the same person who plays the triangle. . . I think. Anyway, if you need proof, this is what it looks like:
Now, try explaining it to someone, lol. "See, you hold it in this hand, and slap the ball in the other . . . "