With the final Borders bookstores closing last week, retail workers took it upon themselves to craft a customized farewell to customers. Blame it on out-of-work crankiness, but some of the observations are on target. (Not that Target.) Our favorites? “It’s called summer reading not three-days-before-school-starts reading” and “It never bothered us when you threatened to shop at Barnes and Noble. We’d rather you do if you’re putting up a stink!”