I know I've read Wikihistory before a few years ago, but I was reminded of it earlier today and it's definitely funny enough to be worth posting here:
International Association of Time Travelers: Members’ Forum
Subforum: Europe – Twentieth Century – Second World War
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! […]
Or possibly not, as it turns out.
Also, from further along in the same Usenet discussion and very much related: The home of Adolf Hitler, 1933: Doubt creeps in.
[Via Dorothy J Heydt, posting to rec.arts.sf.written]