Has anyone had this happen before?

I'm a new Gmod player and i installed some mods overnight and this morning i went to test them on gm construct but when i tried to go into the dark room on the left i heard like "Hey guys this streamer -----" something after that i didnt catch what it said and then around 10 seconds later my game closed is this like a common troll on gmod? or is this a rare occurrence and my pc is infected