Besides the obvious ones (using “less” when “few” is proper, failing to differentiate between homonyms, properly using the apostrophe with its and it’s), there are a number of somewhat more subtle ones that bug me. For instance, I have a boss whose reports I edit who persists in writing things along this line: “This patient has been with me during the last ten years” instead of “this patient has been with me *for* the last ten years”. The expression “centered around” bothers me. How does one “center around” a thing?
Public “Knuckle Cracking” brings the hair on the back of my neck stand up. It triggers the same reaction as running ones finger nails over a caulk board to me. It’s either a nervous habit some people develop when they are younger, with out concern to the destructive behaver it has on their joints years later. This annoying sound people create each time they do it, with out concern or not realizing the effect it may have on the surrounding people . A little public curtsy would be appreciated, grow your awareness of your behavior and make corrective changes before permanent damage is done.