Inverting player view

[Zee]

Is there anyway to invert your viewing angle? (For example, some people used to tilt there FOV in CS, or if you get "drugged" in a server, your viewing angle constantly changes.) I found out a way to do it with env_viewpunch, but it does not go over a 45 degree angle or so.

Basically, I just want to have them looking upside down/screen tilted etc.., but still being able to move. Thanks in advance.

Edit: I got it kinda working with view punch, but I'm wondering if there might be a better way to do it that allows for more steeper angles.