You Know You've Been Doing Too Much Hammer When...
Alexbell doesn't even look at TWP anymore, and I'm an just an annoying person. I don't think I've done anything bad recently, but feel free to correct me if I'm wrong. I love being here and will try to fix problems to stay. Also, while we're on this topic:
It worked 
PS.
When you keep mixing up two light switches and wish you could unbind and rebind them.
This is more Portal 2 than hammer, but today at work (I work in a coffee shop) I wanted to know what size coffee the customer was ordering, so I mentally tried to press TAB to see what my co-worker (coop partner) was seeing. Needless to say it didn't work... I don't have a TAB button with me at work =
I had something sort of similar on my first playthrough of Portal 2. I'd been playing for several hours straight, because it had just been released, and I was so submerged in it I pretty much forgot the real world existed. In one chamber, a cube fell on an AFP and hurtled towards me, which I was most certainly not expecting. My reflexes kicked in and I raised my left hand to try to catch the cube, as if it would cause Chell to catch it or something 
It was at that point I decided it was time to take a break.
You're in the cinema, the curtains go open and you think; those curtains are probably parented to a func_door.
You know you've been using Hammer too much when all Valentines day means to you is, "I should make some tests in Hammer with a Companion Cube meme in it". I never got around to it, unfortunately.
When you're outside, looking at the sky (skybox) and the buildings and props (models), and you wonder what kind of fog controller was put there. You listen to the soundscape from the cars and birds.
Also, this may be more about Portal 2, but, for no reason, I shout "MrMevious!" And people don't understand what I want from them.
I know what you mean by 'MrMevious', but I'm not quite sure I would understand either...
On a side note, I look at shadows and wonder where the env_projectedtexture could be.
None, the world was just compiled hundreds of years ago with TONS of lightmaps, before the 2-on-a-face limit was added to VRAD. All the lighting is static.
The whole day, puzzles show up and overload your brain and sometimes, it makes you waddle outside while you're not even conscious of what's happening until you find out. Probably the best way to get off the couch. (The puzzles are so good, you don't want to stop walking around in circles in your backyard). Besides, something's pushing me to say "Mevious" again. MrMevious! Also I wonder why it's not a real word in the dictionary. (Real stories).
EDIT: Also, because I'm one of these exited people (at least when people are not looking), I "bunnyhop". I'm pretty good at doing it in real life, because, I sometimes climb the stairs starting with the third step.
When you look up on the ridiculously frequent 100% cloud cover days in the UK and it looks identical to someone using skybox/white
