Patrick Wagner, the Senior Search & Digital Analyst at TD Trust Canada, a major bank, posted in the Google Webmaster Help forums complaining that Google listed their mobile site in the desktop search results.
In short, if you search for [canada trust] in Google Canada, the first result shows www.tdcanadatrust.com/m/, which is the mobile URL.
Patrick asked why is it showing the mobile site instead of the standard home?
Google's John Mueller responded in the thread saying:
You're (probably accidentally) specifying this URL as your preferred version for Canada in your Sitemap file at http://www.tdcanadatrust.com/ sitemap-french.xml.
It is nice when big brands make these mistakes and talk about them in a public forum. We can all learn from it and it shows we are all human.
Forum discussion at Google Webmaster Help.