Plucked

Paul's french fry post jogged my memory. When it slowed to a saunter I recalled this...

I went to a fast food counter (I forget which one) a while back and asked for a chicken sandwich. After typing in the order, the girl called back over her shoulder "Gimme a chicken sandwich - and pluck it!" Then she turned back to me and smiled. "Anything else?" she said. A little taken aback, but game, I said, "Just a medium coke, and the chicken sandwich... plucked." The smile left her face. She stared at me expressionless, as if she had just noticed a fingernail clipping hanging from my nostril. (I didn't; I checked.) WTF?