So we agree to leave science out of it?

I watched the William Powell/Myrna Loy movie I Love You Again a few days a ago.  The plot hinges around William Powell recovering some memories after suffering amnesia.  And how does this happen, you may ask?  Well, through the very sound medical process of being hit on the head.  I love that in most movies, one hit to the head means amnesia and then the second hit to the head means recovering from amnesia.  This is not how amnesia works, by the way.