Literally!
My girlfriend and I tried to play RTCW. I made sure the game and computer was updated.
My girlfriend watching me play got really sick with major headache and nausea. I searched the web and found information on how to turn off bobbing. This helped her from getting seriously sick, but the game still gave her bad headaches.
I also notice ill effects. I was having very strange head pressure and feeling really tired the next day.
No other game has done this to us.
The game was fun, but we had to stop. It sucks not being able to finish the game.
I suggest others avoid playing this game.