Even people who never watch soccer (i.e. me) tend to get a little crazy around World Cup time. Serious FOMO occurs and I don't want to miss a single game.
Any other time of the year, I wouldn't care about a game between Japan and Colombia, but for some reason, I was upset I couldn't watch the final 20 minutes of that game when my stream messed up. I've never even been to those countries and probably couldn't name a single player on any of their national teams, but I wanted to know everything that happened nonetheless.
I could only imagine what World Cup Fever is like for people whose countries are actually playing. The stress, the anxiety, the depression, the ecstasy of a well-placed goal. It's all very, very exciting.