The airlock had filled with krausen, blocking it up. I've heard of this happening but this is a first to experience it. I pulled it out of the top stopper to an audible release of pressure. I can only imagine what a few more hours (or minutes) could have done. Boom, with krausen and wort splashing all over the place.
Lesson of the day: Use a blow-off tube for initial and active fermentation. Don't assume you have enough head space.

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