Originally Posted by johnsma22
Yes you discovered what happens when a large quantity of CO2 meets the mucus membranes in your nose. You get carbonic acid and a rather unpleasant sensation, to say the least.
It is a good idea to do this though, you can detect off smells and teaches you what to look for.
I don't use an airlock any more but I still take a whiff when I open the fermenter door to see how its going.