One of those little mysteries....

You know occasionally, you'll get a call from someone, and maybe you left your phone somewhere, so you didn't have a chance to answer it... But just a few minutes after the person calls you, you find your phone, and call them back... In this situation, I think it's inexcusable for the person who called originally not to answer their phone. Every time it happens, I think to myself: "You just called me... How are you not available?"