As I'm writing this post, IndieGoGo donation page for Karen Kline has raised more than $365K. As many of us would agree, something like this has happened before on occasion and I wanted to get a list going and document similar events or instances in the recent years.
On a related note, there are a few terms that have been associated with spontaneous / intensive fundraising phenomenon, the biggest one being "crowdfunding" (wiki), "friendraising" (wiki) and "moneybomb" (wiki / usually for political campaigns).
Here it goes, I'll start with the most obvious one:
The Oatmeal fundraiser (2012): $208,000+ / donation page link