The Best Parent-Annoyer Ever

This is one of my absolute favorites, because it’s so unexpected and unusual… the setup looks quite harmless, but it makes a sound worse than scratching your nails on a chalkboard. If you can’t find the weird ingredient, just use water and you’ll get nearly the same result (it just takes more practice to get it right). Ready?

NOTE: DO NOT place these anywhere near your ear… keep them straight out in front of you.

Here’s what you need:

  • water or violin rosin
  • string
  • disposable plastic cup
  • pokey-thing to make a hole in the cup



  1. What does the rosin (or water) do in this experiment?
  2. What is vibrating in this experiment?
  3. What is the cup for?