The Time Travelers' Potlatch reference article from the English Wikipedia on 24-Apr-2004
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Time Travelers' Potlatch

Time you got around to sponsoring a child
Time Travelers' Potlatch is a surrealist game in which two or more players say what gift they would give to another, usually historical, personage.

The word "potlatch" refers to an old tribal custom which involved the competitive exchange of gifts between two people, the idea being to 'outdo' the other person and thus enhance one's own status within the tribe.

M.K. Shibek has invented a variant of Time Travelers' Potlatch called "imaginary potlatch."

See examples of the game: http://www.surrealism-usa.org/pages/time.html.