10 ways to know when you had too much of L4D2...
1) you walk into a deserted carpark and remind your friends to "not shoot the cars" otherwise the alarm will bring a horde of zombies.
2) you liken a group of people rushing for the last train to zombies running towards a pool of bile.
3) you halt in mid-stride upon seeing a skinny girl with long rebonded hair and long manicured nails and try not to go near her.
4) you auto-siam from the glass corridors of a shopping mall, for fear that the smoker will strangle you from the level above with his long tongue.
5) you dart past darkened rooms, then wait to see if any acid will be spewn from a spitter in hiding.
6) you are still bright-eyed and pumped up with adrenaline at 5am in the morning.
7) you will contemplate attacking the right kind of zombie using the optimum weapon while going through your day. This includes sitting in a car, walking down an aisle in the supermarket and taking a dump.
8) you are willing to spend cabfare back home after gaming when usually u're extremely thrifty with $.
9) you get infuriatingly mad at dying too early in the game.
10) you spend 10mins (yes I know I'm good *takes a bow*) to do up a wallpaper like below:

... and proceed to use it as your desktop wallpaper when 2 weeks ago, you don't even dare to watch the game trailer alone.