Dear Diary: It's definitely summer in the city. Coming out of my Upper East Side supermarket on a recent sweltering night, I spotted a 20-something young man who appeared to be on his way home from the office. As he came to the store's outdoor display of flowers and plants, he put down his briefcase, grabbed the stand's garden hose and showered his head with a squeeze of the spray nozzle. A store employee looked on wordlessly. The man wiped off the excess water, replaced the hose and continued on his way, refreshed. I guess that's what you do when...