wanting to tell a co-worker: "if the possibilities are that the customer is mistaken, or that software which has been consistently working since I wrote it years ago has abruptly broken for just this one person... your first guess should be it's the customer fault"
The free puzzle shelf now has signs explaining the concept in English, French, and Spanish. That covers the most common languages I hear people speaking here. Italian is rare here (only hear that a few times a year) and the German speakers do a lot of code switching so I figure they're covered.