Emailed to me from another humor list (Marty's Joke of the Day)
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A research team proceeded towards the apex of a natural geologic protuberance, the purpose of their expedition being the procurement of a sample of fluid hydride of oxygen in a large vessel, the exact size of which was unspecified.
One member of the team precipitously descended, sustaining severe damage to the upper cranial portion of his anatomical structure; subsequently the second member of the team performed a self-rotational translation oriented in the same direction taken by the first team member.
TRANSLATION:
Jack and Jill went up the hill to fetch a pail of water.
Jack fell down and broke his crown and Jill came tumbling after.