To get the amusing talkie stuff in L4D2, you can bind a key to certain vocalize commands either in console or in your config file:
<blah>\Steam\SteamApps\common\left 4 dead 2\left4dead2\cfg\config.cfg

Mine are:

bind "HOME" "vocalize playeranswerlostcall"
bind "PGUP" "vocalize playergroundpoundedbytank"
bind "INS" "vocalize useadrenaline"

The playeranswerlostcall is Nick's sweary one, but other characters supposedly have amusing things on the other 2, so I've binded all three.

Cannonfodder said:

The playeranswerlostcall is Nick's sweary one, but other characters supposedly have amusing things on the other 2, so I've binded all three.

I've bound ?
What does Gaz have to do to make the laugh-emote when he kills Pete, though ?

Killing me is usually a good start ;-)

I recall correctly, the server admin has permission to re-bind player buttons remotely (or at least did in the original Half-Life engine - haven't tried it with Source). I used to occasionally punish someone who was griefing on our Day of Defeat server by binding their firing key (Mouse1) to say something that amused me.

This should not be taken as carte blanche to fuck about with members' settings.

/me sets his Config files to "Read Only".