You could always go to edit and just delete the text you've written, if you can't delete the whole post ...
You dont You have to leave your drunken ramblings from the night before for all to see and read in the morning This allows you to cringe as you read it yourself and then take a load of ribbing from the members that are reading it all fresh faced in the morning whilst you have a stinking hangover and feel awfull Its all part of the punishment for getting piddled whilst using the internet