when someone mentions getting to a chopper, you think of Arnold second.
when free running, you instinctively crouch down for 5 seconds before making large jumps
when you scream like a banshee whilst making said jumps
when you enter an elevator and expect to hear an amusing exchange of dialogue
when you start calling zombie bullshit
when you see a bottle of beer and instinctively huck it at a large group of people
when a pipe bomb with a smoke detector duct-taped on to it doesn't seem like a stupid idea for a weapon.
when you're disappointed that the nearest counter isn't stocked full of assault rifles and auto shotguns.
when you mistake a children's backpack for a med kit
when you think that old people are pretty bad-ass
when your first instinct to seeing an angry mob is to violently swing your arms from right to left
when your first instinct to hearing a crying woman is to run over and smack her in the back of the head
when you know Louis, Zoey, Francis and Bill better than most people know their mothers
when when you think one pistol just isn't enough
when you think you're good enough to take the Hunting Rifle
when you call the shotty a noob cannon
when you throw up and instead of cleaning yourself off, hide in a corner for 3 minutes
when wearing a hoodie makes your mouth water
when the Tank is legitimately threatening with his tongue hanging out
when you start modding
when green smoke doesn't take you out of the gaming experience
when you were too busy playing l4d to think of more examples of this.