From the New York Times: Mistakes in Typography Grate the Purists.

Seeing the clean, crisp shapes of those letters and numbers at station entrances, on the platforms and inside the trains is always a treat, at least it is until I spot the “Do not lean …” sign on the train doors. Ugh! There’s something not quite right about the “e” and the “a” in the word “lean.” Somehow they seem too small and too cramped. Once I’ve noticed them, the memory of the clean, crisp letters fades, and all I remember are the “off” ones.

That’s the problem with loving typography. It’s always a pleasure to discover a formally gorgeous, subtly expressive typeface while walking along a street or leafing through a magazine. (Among my current favorites are the very elegant letters in the new identity of the Paris fashion house, Céline, and the jolly jumble of multi-colored fonts on the back of the Rossi Ice Cream vans purring around London.) But that joy is swiftly obliterated by the sight of a typographic howler. It’s like having a heightened sense of smell. You spend much more of your time wincing at noxious stinks, than reveling in delightful aromas.