You'll have to use your imagination a bit for this one. It's a bit Trigger Happy TV but I think it could be quite amusing.
ADVENTURES IN NARNIA
INT. Camera gives us a view down an aisle in a busy Ikea store. We see the usual hustle and bustle. A man in a Lion constume, closely followed by a Witch, come onscreen and open the doors of one of the wardrobes on display, look around to check if anyone's watching, then climb in.
I'm not sure whether this one would work better if filmed normally in full colour as I've described it above, or as we would see it on a security tape (in black and white, maybe a bit fuzzy). On second thoughts I'm thinking the security tape would be better.
Or possibly the characters coming out of the wardrobe rather than climbing in? Should have given this more thought.