* Player Kill enemy

meet your damn maker
there goes another

* Player collects weapon

let's rock 'n roll !!
hm... guns

* player Health is low

I'm felling weak
get me some painkiller
gimme asperine

Edit:
better dont et the player say that sentence all the time when he kills and enemy or collects something that would be really anyoing if you have to kill a lot of zombies.
better let him say the sentences if you are in a kind of rush or something like that