Yea yea I know, airlock activity is not an indication of fermentation. But when I went to bed last night it was gurgling like a drowning man. Walked over to the carboy and the airlock was empty except for one tiny little drop in the crook of the S-curve keeping a seal. While rushing for my spray-bottle of starsan so I can pour some in to refill it, I comtemplate on how it could have gotten emptied. The kids haven't been in there to mess with it, and there wasn't a big temperature drop overnight to create negative pressure and suck it in.
5 seconds after filling back up with starsan and reinstalling into the carboy bung, I had my answer...
Every bit of it foamed and oozed out from under the cap in under a minute. I boiled a some water to refill this time.
Man those little WLP013 guys are hungry! I've never had a fermentation this active without blowing off, but this barely has a 1/2" krausen. Weird.