Story Concept: A secret society of paleontologists and archeologists who make a pact that when each of them dies the others will go to wild lengths to stage burial circumstances most likely to be preserved, even fossilized to confound the intelligent life of the far future. This includes weird burial objects, suggestive poses, etc.
They make the pact when young & silly, but as they grow old and carry it out it becomes a much more serious & momentous thing. About keeping promises & friendship.