about 5 years ago i was playing on this map, i went in the middle of the road, and all the sudden i started hearing the reversed screaming noises from half life 2 and i was scared, i saw a pitch black version of the stalker from half life appearing in front of me, i exited the map so fast. i dont know if it was an addon trolling with me or it was in the map, i highly doubt it was in the map cause of source limitations. has anyone else experienced this?