There are an overwhelming amount of things you'll probably notice when going over to a man's apartment or house for the first time. His decorations (or lack thereof), whether or not he's made his bed (he probably hasn't) and if he has a couch or just a couple of lawn chairs set up in the living room in front of the TV. It's a harsh reality, but it is all very possible.
One of the biggest question marks, though? What he has on his bookshelf -- if he has one at all. A tweet recently went viral for identifying the "warning sign" titles that could appear on a man's bookshelf, and it got the rest of the internet thinking. What else would be a warning sign? And how accurate is this? We're in a tizzy.