Something interesting happened a few weeks ago. I made a batch of Belgian American ale and split it into 3 vessels from the fermenter. 3 gallons went into a small carboy for intentionally souring, 5 in a keg for serving and another two in another keg. I have made this recipe 3 times before, but this is the first time that I transferred using co2. I pushed co2 into the fermenter and it pushed the beer through the wand and tubing into the kegs... All went well until the last 2 gallons. At that time, the leaf hops from the dry hopping started clogging the wand. I had to pull it out and unclog it at least 10 times and there was also quite a lot of bubbling and burping co2 and splashing beer inside keg.
What was strange is when I went to pour it 20 or so days later, it had turned purple/grey/black. Flavor was off, but at the time I didn't really think cardboard. I am assuming that I oxidized it quite a bit with the splashing and the screwed up transfer.
I think it's too bad that everybody's decided to turn on drugs, I don't think drugs are the problem. Crime is the problem. Cops are the problem. Money's the problem. But drugs are just drugs.