A three-pound rat was found in the Foja Mountains of western New Guinea, Indonesia. Experts think it may be a previously-unknown species. It is five times the size of regular city rats, and has no fear of humans. That sounds suspiciously like the premise for a horror film. Link
(image credit: Bruce M. Beehler/Conservation International)
The first thing I was reminded of was "The Tale of the Giant Rat of Sumatra"
http://en.wikipedia.org/wiki/The_Tale_of_the_Giant_Rat_of_Sumatra
If you really want to see the ROUS's from The Princess Bride, take a look at a Binturong.
A cool find, though.
http://nl.wikipedia.org/wiki/Muskusrat