http://infochimps.com/datasets/d60000-documented-ufo-sightings-with-text-descriptions-and-metad
Description:
A comprehensive listing of over 60,000 unidentified-flying-object (UFO) sightings in the United States (and some elsewhere). Fields of particular interest are the shape, which describes the shape of the UFO encountered as well as the description which is free-form descriptive text about the event. Data available as both a tab-separated-values (.tsv) file and Avro