My daughter (age 8) got a chain letter from a school friend of hers last week. A real snail mail chain letter. It purported to be trying to set a Guiness Book of Records record and was sent FreePost (no postage required). I'm pretty surprised the Royal Mail delivered it. After searching around the Internet, I found out that variants of this chain letter have been in circulation since 1981! Geez. Talk about perpetual motion! Check out Break The Chain.