Okay, fun story. I went to bed last night, I was at 9975 or so subscribers. Then this morning I wake up, and somehow I'm over 10000. That count doesn't budge for most of the day, and suddenly I'm up to 10025. I haven't seen a sub surge like that in eons. Not since I ended up in Chugga's related videos, in fact.
What I want to know is, where is this coming from? Clearly someone's been advertising somewhere, but I can't see anything on Analytics yet.
Edit: Still rising. 10035 now. And I'm more and more baffled.