A Mobile Phone Embedded in Asphalt
If future anthropologists would ever dig up this cellphone, they might identify it as some sort of mysterious pseudo-religious device carried around fervently by early 21th century people?
See also: Gameboy Bricks a million years from now, Tribal Communication Technology, Handset gets taken to the grave. Via Beyond the Beyond.

Related: http://www.nextnature.net/?p=1877
Sure! I forgot about that one. Added.
or maby a very unpractical device to make fire
yes, or popcorn!
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(no.. that was a hoax: http://www.nextnature.net/?p=2647)