https://www.pcgamer.com/all-this-time-aliens-colonial-marines-stupid-ai-may-have-been-caused-by-a-single-typo/

Aliens: Colonial Marines released on February 11, 2013. It wasn't very good. As Chris Thursten noted in our review, the AI of the aliens was especially bad. At the time, he said, "aliens pop out of vents and pop back in again, get stuck on the ceiling, fall off walls and run in circles." Well, it turns out the game's laughably stupid xenomorphs may have been caused by a typo—more specifically, a single letter mucking up the game's code.

As ModDB user jamesdickinson963 explained in a recent post, a line of code in one of the game's .INI files has a small but serious typo. This was spotted by poster JigglesBunny on Resetera, so we decided to investigate. Note the unneeded 'a' in 'tether' in the second line of this snippet: