I know you guys are sick to death of the found footage thing, but this is rather fun. I mean, it takes place at The Haunted Mansion in Disneyland - what could be cooler?!
The short is called "Missing in the Mansion." It was made by these fellas named The Daws Brothers, and deals with a proposal that goes awry at the location in question. I won't ruin for you what happens, but it uses the Mansion creepily and effectively.
Here's the set-up: On July 6, 2012, three friends went missing. They were last seen at the Disneyland Resort in Anaheim, California. A Cast Member working in Lost & Found discovered a camera that belonged to them containing the following footage. It has not been altered in any way.
For more info, head on over to the official Missing in the Mansion website.