I just recently started kegging. I found I had a keg in my keezer with a leaky post. While putting on a different post tonight, which fixed it, I made an embarrassing mistake. I released the pressure and changed the lid seal and left the out post loose. Well, of course I turned the gas on to seal the lid.....with the post just sitting there. I shot the tube out of the keg and a spout of beer to the ceiling. I shut the gas off and cleaned everything off. Luckily the repairs worked and my Sam Adams Maple Pecan Porter tastes great. Just a really DUMB mistake!