Black Mesa is a real place, but I don't think there's a research facility there...it's just the name of the location.
-When someone in your form spills very strong acid on one of your friends during a chemistry lesson, and you feel sorry that the victim wasn't wearing an HEV suit...but he survived with a bandaged hand, and the knowledge that he's getting close to being able to sue the guy, since that person also injured another of my friends' heads (Again, by accident). True story.
YOU KNOW YOU'VE BEEN USING SD MODELS TOO MUCH WHEN:
-You wonder why security guards with pistols don't have an M4A1 strapped to their back (Ambient.Impact's SD Barney has an M4 on his back, but he doesn't use it)
-You think all security guards should wear HEV suits (Like the barney in my av)
-Your glasses are so dirty that they appear to be opaque, and you look for a place to download the transparency dlls from (Not true, I don't wear glasses)
-You keep bugging everyone around you for a Barney with an Uzi, and they have no idea what you are on about (Half true, I've been bugging people on the HIT forums for that)
-You start getting people with low-def hl model avatars to get a new one with an SD model (Haven't done it yet...)
Anyway, back on topic:
-When your internet is even slower than normal, and you type in r_speeds 1 as an URL, to check the ipoly (Internet poly)
-When you see a guy with a crowbar, and compare it to the HL one (Guilty)
-When you're playing 007: Everything or Nothing, and grab a terrorist's crowbar to recreate HL (Guilty for a few seconds, I then got shot dead 'cos I had to run to the guy who was shooting)
YOU'VE BEEN PLAYING BLUE-SHIFT TOO MUCH WHEN:
-You can't read your email because your internet is malfunctioning, and you then say "I can't access my files, I can't answer my mail. I haven't even been able to get into my office!"
-When you're watching Black Books, series 3, episode 1, and compare the evil guy who runs Goliath Books to Dr. Rosenberg (He looks very similar! And I'm guilty, obviously)