You're right, it's The Addams Family.  Gomez Addams blowing up model trains.

I didn't think this was going to be any good, but any movie about any kind of supernatural teenagers is definitely fighting an uphill battle for me to want to see it.  Probably going to have to check this out now.

Holy shit I didn't even notice the whip.

And I believe that withholding the information for how they got there was entirely intentional, because if we had been there to see how the scheme began and how it all got started, the bit where Frank pops out from under the bed and we're like, "Oh snap, Frank's here too!" wouldn't have worked nearly as well as it did.

I generally don't like to be nit-picky about quotes, but I feel it is important to note that Mac actually said "hamburger store", which was one of my favorite moments in the whole episode for some reason.