Creepy Voice in chamber 09 Is it Normal?

[Quadsquad99]

I was playing on chamber 9 trying to get the transmission recived achevment and i grabbed the radio and it accidently went into the fizzler and i heard a loud creepy static voice screm "GET OUT" I then preceded to cry soflty in fear...is this proggramed into the game or did i buy some haunted copie off of steam?

[76561197998994485]

It's part of an ARG that was placed to announce portal 2

all radios carry a secret message if you use certain things with them or take them certain places

[Electro Blazer]

the radio does not always sound like a GET OUT! i just did the chamber a second time it said something else idk what it said