ha! I had that happen a few times. I always chop away at it to see what the beer level in the keg is so I don't fill above the gas-in tube.
Fermenting: Festbier, IPA, Saison, hefeweizen, American Wheat
Drinking: Bananas Foster Hefeweizen, Pilsner
On Deck: Milk Stout / Scotch Ale