880 in less than a day? I am very curious.
My first guess would be that someone with a lot of followers linked to it on Facebook or Twitter.
I've found one mention on Twitter, but it's not from someone with a lot of followers.
UPDATE: Found it. Note the number of subscribers to that particular subreddit. Anything that gets any traction at all there will be clicked on by many.
I am going to telll you the truth .... When I found this question, I did something very special, which usually I do not do: I mailed it to my friends as 'the joke of the day' ... and they loved it, and forwarded it to their friends, etc ...