VIDEO: http://www.youtube.com/watch?v=uDbIcON9y8E
THREAD: http://www.facepunch.com/showthread.php?p=14022803#post14022803

RECOMMENDED DOWNLOAD
Link: http://www.garrysmod.org/downloads/?a=view&id=84091

INSTALLATION
Put it in your addons folder.
Directory: "Steam\steamapps\STEAM ACCOUNT NAME\garrysmod\garrysmod\addons"

HOW TO USE
You now have to bind the keys in console.
Just type bind X BailOut and bind X Jumpout.
X = the key you want to use

If you still don't know how to bind things in console you should take a look at the tutorial video.
Link to tutorial: http://www.youtube.com/watch?v=CddRhjTiKW0

CONSOLE COMMANDS
All the console commands will toggle between two modes (except for WindShieldCannonThreshold) you just type them as they are.

Console example

The wrong way: ChairJump 1
The correct way : chairjump


ChairJump - Disables or enables the abilety to JUMP out from seats/chairs like a ragdoll.
ChairEject - Disables or enables the abilety to EJECT out from seats/chairs.

CarJump - Disables or enables the abilety to JUMP out from cars/vehicles like a ragdoll.
CarEject - Disables or enables the abilety to EJECT out from cars/vehicles.

WindShieldCannon - Disables or enables the windshield cannon.

WindShieldCannonThreshold - Set the threshold when a player should fly out from the windshield. The default value is 15 which i recommend.
Lowest value is 5 and the highest is 25. Values you can use: 5, 10, 15, 20, 25. all other values will be rounded up.

CHANGES

v 1.3
*Added windshield cannon
*Added Console command to windshield cannon
*Added Console command to windshieldThreshold cannon
*You now have to bind Jump out to a key in console
*You now have to bind Bail out to a key in console
*Fixed conflicting values with other addons.
*Fixed Cars will not abruptly stop after bailing out or jumping out.
*Fixed weight on the bail out seats.
*Fixed clients executing console commands (not admins).
*Fixed console warnings.
*Fixed some multiplayer bugs.
*Fixed DeathFix spawning two ragdolls (only spawns one now)
*Fixed some kind of no collide problem.

v 1.2
* You can jump out from any vehicle or seat (GTA style).
* The ragdoll takes damage.
* The ragdoll has a health bar (requires to have sv_cheats on in multiplayer)
* Enabled bailout on vehicles (cars and such)
* Added console commands to disable/enable bail out and jump out on cars and seats.
* Added "resource add file" so players joining a server will download the necessary content.
* Fixed many other multiplayer bugs.
* You will no longer need to re-weld the seat after bailing out because now it will create a new seat instead and put you in it.