One example of where you will find me is many locations inside of one building. When I'm new I'm plain but after first use I'm never the same people clean me a lot but I'm never like new the changes come off but leave residue. You will have seen me in your early years I'm definantly a tool for the eyes not the ears but there is a sound that I can make to cause the strongest man to quake.

Sounds like glass to me. Breaking glass makes anyone shutter.

Try,.

A chalkboard

A man went to a carnival. He brought his 2 daughters, they each brought 4 kids, and each kid brought 3 friends. How many people are going to the carnival?