schroedingers restaurant

A restaurant that exists but you don't find the adress . So it both exists and doesn't exist at the same time.

Person 1: " hey how was it at the restaurant you wanted to check out last week?"

Person 2: "oh my. We walked around town for hours but couldn't find it although we had the adress."

Person 1: " seems like a Schroedingers restaurant. "