An alien with a lemon-shaped head and a jazz-themed encounter with a UFO at the Glastonbury Festival are among hundreds of UFO encounters detailed in the latest batch of documents released Monday by the UK's Ministry of Defence._extended="true"> _extended="true">_extended="true" />_extended="true"> _extended="true"> _extended="true">A sketch of a UFO made by a witness following a sighting in 1993._extended="true">_extended="true" /> _extended="true">Fourteen files, containing over 4,000 pages of