A package arrived today at ComingSoon.net's ShockTillYouDrop.com that included a children's tea set with a note ominously saying, "Knock, Knock" with a URL link printed out.

What's it all mean? Why, it's a fun little promo for the upcoming DVD, Blu-ray and VOD release of Paranormal Activity 3. The disc streets on January 24 and arrives with a theatrical and director's cut (specifics can be found here).

You can check out the two clips by clicking here!