A couple years ago, I played golf with my father-in-law.  The twosome behind us were constantly waiting on us but we were keeping pace with the group ahead so there was not real opportunity to let them play thru.  On the 18th hole we parked the golf cart in the fairway as we looked for an errant drives.  Walking back into the fairway, the gentleman’s tee ball landed a few feet from us.  We raised our clubs and shout “just wait a second.”  The woman jumped into their golf cart and raced up the fairway.  My father-in-law and I were perplexed at this response to our our shouts of dissatisfaction   The woman arrived in tears.  She explained that her husband has early onset Alzheimer’s symptoms and had teed-off on his own recognizance   Immediately, we felt terrible.  We had assumed their constant shadowing was poor etiquette when in reality it was the wife’s best effort to chaperon for her ailing husband.  Upon reflection we noted that his execution was flawless on the golf course.  Where his mental faculties had begun to fail, his physical skills were superb.  

What assumptions do we make that have been false?  What do they cost us?