I agree on the office nail clipping, one of my coworkers clips his nails WHILE on the phone with our suppliers...
Also, one of the accountants in our office walks by my group every morning, and says "Good Morning, Retail Division" (we supply stores with perishable products, don't actually work in the stores). This drives me crazy!! Does that mean he doesn't want Sales to have a good morning? What about Bookkeeping and Data Entry? He never says anything to them. Why doesn't he just say a general good morning to everyone? Some morning I'm going to get everyone in my group to say "Good morning, Accounting!" and see how he likes it.