Talk about the biggest fails you've had with AI characters in games!
The biggest fail I've seen was probably in Halo 2 when me and two AIs were all in ghosts. A warthog with another AI in it came out of nowhere and when I turned around, I saw it falling off a cliff. Then, the ghosts followed it of the side of a bridge. I then had no AIs with me.
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Left 4 Dead. Bill ran off the edge of Mercy Hospital in the No Mercy Campaign. Louis once had his flashlight on and stood there, staring at the Witch.