Wikihistory is a funny short story about revert-wars in a fictional time-traveller forum ("International Association of Time Travelers"). Anybody who had a look at a talk/ history page on Wikipedia previously will be reminded of similar invisible wars going on on hot/ sensitive topics there too.

At 14:52:28, FreedomFighter69 wrote:
Reporting my first temporal excursion since joining IATT: have just returned from 1936 Berlin, having taken the place of one of Leni Riefenstahl's cameramen and assassinated Adolf Hitler during the opening of the Olympic Games. Let a free world rejoice!

Via boingboing