This morning, I grabbed my last case of honey from last year's batch and brought it upstairs. (Luckily, I'm taking this year's honey this coming weekend!!) I noticed that each jar had some bubbles in it. I opened the first jar and whooooffff...it sounded like a small can of tennis balls as the air gently came out. Hmmm...that's odd. I opened another. Same thing! Each jar in this case made this exact same pressurized noise. Does this mean that this case has started fermenting? It's a dark, tulip poplar honey so it hasn't turned to sugar yet. I've never experienced this before and never had honey ferment.