There are certain service workers that it is more customary to tip than others. I guess this can differ from place to place. Which ones do you tip, and why? Also, is there any rhyme and reason, as to which kind of workers it is customary to tip? I suppose it's pretty traditional to tip cab drivers, and I guess that's why some of us feel we should be tipped (as a logical extension to that). Anyway, I guess the point of this thread is to discuss tipping in general, why we tip some professions and not others, and how this is relevant to us.