Ankles

They look like a prop from the movie TRON.

While its not required, it is considered good form. If you always go to the same sharpener, or at least the same place and they do a job you are satisfied with, then throwing them something will not only make them remember you next time, they will make sure to keep pumping out quality work for you. However, some people are jerks, and if your sharpener is one, regardless of the job they do, then forget it.

I'm sure this has been covered already, but I must reiterate. The #1 thing I hate that customers do is bring in a friend who "knows about hockey" to give them better advice about the equipment that I sell in my store, as if my knowing all the technical aspects isn't enough. But I must agree with Ngo_35....Hot MILFs.