Tin cry Tin cry A tin cry is the characteristic sound heard when a bar of tin is bent. Variously described as a "screaming" or "crackling" sound, the effect is caused by the crystal twinning in the metal. The sound is not particularly loud, despite terms like "crying" and "screaming". It is very noticeable when a hot-dip tin coated sheet metal is bent at high speed over rollers during processing. The tin cry is often demonstrated as a simple science experiment. The bar of tin will "cry" repeatedly when bent until it breaks. The experiment can then be recycled by melting and
Wedding customs by country were considered a personal event and inviting people to the wedding who are not known to at least one member of the couple well enough to be able to choose an appropriate gift was considered inappropriate, and registries should therefore be unnecessary. Whether considered appropriate or not, others believe that weddings are opportunities to extract funds or specific gifts from as many people as possible, and that even an invitation carries an expectation of monetary reward rather than merely congratulations. Letters of thanks for any gift are traditionally sent promptly after the gift's receipt. Tradition allows wedding gifts to be