How can you make your player scream in Left 4 Dead and Left 4 Dead 2?

I remember when I played Left 4 Dead, a couple of months ago, that some players were able to let their controlled character do a scaring long scream.

How did they do? Is it possible to do this also in Left 4 Dead 2?

Solution 1:

Valve removed the vocalization commands to stop people spamming in multiplayer games, all that is left are the speech wheel that come up when you press z or x (using default controls).

Edit: This is the very hacky way of doing it through the radial commands which may or may not work.

Solution 2:

1. You need to go into your console (it's disabled by default, go into your options menu and enable it).

2. Press the key next to the "1" key on the top left of you keyboard to bring the console up.

3. Type in the following:

   bind b "vocalize playerdeath"

4. b is the key you are binding to, change this to whatever you want.

5. Happy screaming, just don't spam the hell out of it.