How can I make a can telephone?

To make a can telephone, you will need two empty cans, a sharp object to poke holes in the cans, and a long piece of string. First, poke a small hole in the bottom of each can. Next, thread the string through the holes in both cans, tying knots on the inside to secure it. Finally, hold one can to your ear and have someone else speak into the other can while holding it to their mouth. The sound vibrations will travel through the string, allowing you to communicate with each other.