Okay here's one for you, I brewed a batch of APA before I left to visit family over the new year (which by the way was way darker than it should have been, a question for another thread I suppose). When I left super early on Dec 26th there was little to no sign of fermentation munch to my chagrin. It was brewed on Dec 22 (i live at 8750', my fermentations seem to lag), but I hoped to be through the thick of it before I left and was going to keg on my return. Well, apparently some time after we left the house fermentation went gang busters as it blew the stopper right out of my carboy
On return to the homestead on Jan. 5 I found my beer with a thick, dried foam around the carboy opening (almost completely capped itself off, but not quite), I'm guessing it spent about 7 days like that. .... so, I'm wondering, do I siphon this off to a secondary & wait to see if anything nasty grows?, do I dump a couple of Lambics in there and try to sour it?, do I keg it & hope for the best in a couple of weeks?, or should I bottle it & forget it for a year?....any thoughts?