This is generally assumed not to be due to foul play, but because of the Adams Precedent. Adams noted that 'an early editor of the [Hitchhiker's] Guide, famous for taking very long lunch breaks, left for lunch late one morning and has yet to return. It is hoped and assumed that he will yet return and put in a solid afternoon's work, and his desk has been left completely untouched save for a small sign which says "Lig Lury Jr., Editor. Missing, presumed fed."' Mornington Crescent Committees disappearing under similar circumstances are said to be following Adams' Precedent.
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