"Wait a minute... oh, sorry, I forgot, we're on TF2 and you're wearing the Swarm Parasite..."
If you ever heard that, it means that the player has played too much Alien Swarm or he's just joking, like I did on the server I'm admin for, being a pyro and purchasing a poor Engi with the Parasite as hat... Unfortunately for him, if he hadn't build a sentry (because it's a no sentry server), he wouldn't have seen me trying to crack a joke.
The main reason behind this is the fact that I wouldn't have played Alien Swarm in a normal time. The factors that brought me to turn as a fan aren't the original Unreal mod or that it's Valve behind or that it's not a third-party fan mod. If it wasn't free, I would have let it where it was stand...