Missed Call

You know what I hate?  When someone calls you on your cell phone and you just missed it.  So you immediately call them right back, and then they don't pick up the phone!  How in the world can they not answer it when they just called you two seconds before!  Obviously whatever they have to say isn't important if they aren't going to answer the phone, so why did they call you in the first place?  Just don't call!