Advertised as "The World's Smallest Theatre," the Theatre of Small Convenience in Greater Malvern, England, was converted from a public restroom. Of course, this is England, and a converted Victorian WC apparently looks something like this:
Puppeteer Dennis Neale took the abandoned building and transformed it into a tiny theatre, with a puppet stage and seating for 12.
The stage (you can see some of the chair seating to the right):
The strange and fascinating front door: