Here’s a user interface failure courtesy of Apple:

Note that the window cannot be expanded (why?). So how exactly are we supposed to know what the “Convert Selected Simplified C…” refers to? I’m not sure why any dialog windows are designed to be unexpandable – what’s the point of this constraint?

I guess on the bright side, very very few people understand or use the Services menu anyway. But when it comes to user experience, the devil is in the details.