where you get to like 10:00 at night and you are sure that you ran but you just couldnt recall the run itself?  Had that day yesterday but my wife assured me that I ran.  Later, I kind of remembered getting dressed for the run and leaving the house but still couldnt really recall the route I ran.

Yes, especially after stringing together several 1-2 mile runs.  The short ones are tough and not changing it up even tougher to remember what you have done.  I almost always log my run after I get done just because I am too afraid of forgetting