The Longship Voyage!

Oooo dear, the washing machine seems to be faulty. It's got stuck on "Boil Wash".

*watches in amusement as Vikingess retrieves the now-6-inch-high decoy from machine*
 
I suppose you could put it very close to the other person and try to trick them with perspective.

Actually, I always quite liked the idea of being a set of Russian dolls, so that I could open up to reveal progressively smaller and smaller versions of me.