I watched my lager happily bubbling away. I made this on Monday morning, pitched the yeast at 2am (after New Years celebrations) at 54 degrees, and it took off by mid day on Tuesday. It was going like crazy by Wednesday morning, and still steadily today.
So far everything on this batch has gone well. I got good efficiency with BIAB, the beer is light colored as wanted, the hops have a nice balance to them, the fermentation is going great, the temps in my cold room have stayed between 48 and 50 without any intervention, and the weather forecast is for more of the same outside so inside will stay the same too. No scent of diacetyl, but I wouldn't know if I'd be able to detect it anyway from the airlock.