The many worlds interpretation is super-duper testable in the sense that it is falsifiable. It's kind of like Jose Luis Bojes' wonderful short story about the Library of Babel, where every book that you could possibly imagine is there. The only reason I'm asking is that in everything everywhere all at once, the inhabitants of one of the universes have these sort of hot dogs for fingers. You're not unlovable. There is always something to love even in a stupid, stupid universe.