The Mind

Why is it that some things we seem to forget in an instance. And other things we can't for the life of us erase it from our minds.  I know our minds are like sponges............but seriously sometimes I just want to clear the mechanism.  Then there's that time thing; coming back to me like a bad penny.  I think I'll just hit ctrl-alt-delete.  Oh never mind, time is the only thing that works...........again!