One guy of the Addams Family is coming home, wants to open the main door, but accidentially drops the key.
suddenly the hand jumps out of a broken window (just a small hole) right next to the main door and quickly grabs the key and then hides.

Now get back the key to get into the house.

Maybe something to build on. I don't know the Addams Family too well, so it might also be off.