Erik sent this picture from QGIS meetup in Bratislava. Put 5 map geeks in front of a map and you will get a heated discussion of cartography, projections and stuff, add some beer and it might go on for quite a while.
Marc-Tobias asked “Is this a map (in the wild)? If so of what?” The answer is Michigan, US and apparently they celebrate something called Plaidurday (massive bonus points to me for working this out). I am going to mark my calendar for next year and wear a check shirt.