It's just like when your regional baseball team makes it to the playoffs and suddenly everyone is a fan... only fair weather soccer fans are 204 times more annoying, mostly because the Cup goes on for so damn long.
Stop quoting scores and bitching about unfair penalties. Stop trying to convince others that you are the BIGGEST SOCCER FAN EVAH!! Please stop complaining about the effin' vuvuzelas.
Seriously, just STFU and get back to work already.
