The hardest work -- my opinion, of course -- is those that deals with front line customers. The irrational and angry customer who you can't reason with because

The hardest work -- my opinion, of course -- is those that deals with front line customers. The irrational and angry customer who you can't reason with because they want to be angry for angry's sake. It's hard because it is incredibly dissatisfying and a "win" doesn't carry over to the next interaction.