So far I usually use my glass carboy for fermentation and use the plastic one for bottling or secondary. I haven't really used it for primary yet. I had to use it recently on a Belgian Dubbel Wyeast 3787. I always smell my beer as it ferments through the air lock. Usually it smells awesome! This one was a bit different all around. The fermentation was super fast, almost over night kinda fast. Which I had happen with other yeast but not this kind so the fast fermentation didn't bother me. It had built up a huge krausen like expected so I let it sit for a few weeks. Finally I was to transfer it to a secondary so it could sit there for a while and like I usually do, I went to smell the beer. Since this was a plastic bucket I could just stick my head in. That was a bad idea! The smell immediately burned my nostrils and I immediately retreated. My first thought was shit an infection and went to smell it again to see what it is. Really hot alcohol smell that, yep still burned the nostrils. Took a sample for gravity reading and a taste test which seemed to be fine. So I figured if it tastes alright its probably not an infection. The only thing I could figure at the time is that there was a lot of CO2 built up mixed with alcohol and nasty krausen stuck to the sides that made it smell so bad. I don't remember getting any kind of smells like that from my glass carboys. Anyone else run into this?