Tin Can Telephone is a classic game of communication and fun for kids of all ages. It's a simple game that requires two cans, string, and a little bit of imagination. Players tie a string between two cans and then talk into one can while listening through the other
From Wikipedia
Tin is a chemical element; it has the symbol Sn and atomic number 50. A metallic-gray metal, tin is soft enough to be cut with little force, and a bar of tin can be bent by hand with little effort. When bent, a bar of tin makes a sound, the so-called "tin cry", as a result of twinning in tin crystals.