Asians do all sort of weird stuff. While browsing on YouTube I found this funny (yet amazing) video of someone that managed to spawn around 40 Treasure Goblins in the same room. In case you are not aware of the Puzzle Ring item in Diablo 3, this is what was used to spawn them.
I stumbled upon the weird side of YouTube again, and guess what I found? A room full of Treasure Goblins! The count is about 40, but I could be off by a little. It's hard to tell due to the quality.