Until today, I didn’t know about the International Football Association Board, which is the non-governmental organisation that is responsible for maintaining the official global football rules (the “Laws of the Game”). I also didn’t know that this organisation has exactly five members – of course the FIFA, but also the [English] Football Association, the Scottish Football Association, the Football Association of Wales and the [Northern] Irish Football Association.
You should read the Laws of the Game. They’re not only very informative, but at times also funny. Would you have known about this clause from Law 17 (“The Corner Kick”):
A goal may be scored directly form a corner kick, but only against the opposing team
They wouldn’t have created such a rule if this didn’t happen at some time in the past, though I honestly can’t imagine how it should be possible to kick an own goal from a corner kick.