The barbie effect

A supernatural effect meaning that right in the moment when you need something, it doesn't actually work or it vanishes all of a sudden (and obviously after you don't need it anymore it appears out of the blue or, even worse, it works).

We couldn't see the movie yesterday night because of the barbie effect.

-Hey, John, can I borrow your bottle opener?
-Sorry, man. I can't find it, the barbie effect strikes again