Here is a short list of things not to do at work. I'll try to dispel what you might think as you start to read this first: the list may seem silly, or even incredulous, and you may think this stuff doesn't get noticed by anyone, but trust me, it does. And this stuff is present in every work environment I've been part of. You'll go further if you take heed.
1. Don't wear cologne. This one tops the list because it has long been a pet peeve of mine and frankly, why would you want to walk around wafting that scent all over the place? It stinks. It's offensive. It forces me to have to smell the scent that you, or your aunt, or your mother, or whoever gave you that noxious concoction as a gift for your birthday - think is pleasant to the olfactory neurons in my brain. Trust me - your sense of what smells pleasant isn't as good as you think. You have body odor, you say? Try wearing deodorant and practicing better hygiene. Problem solved.
2. Don't clip your nails. Picture this: you are working diligently at your desk when, like a flying superhero crashing back to earth, a fingernail flies through the air, narrowly misses your face, and lands on the page you're reading. Yep, it's happened. And then you hear that familiar clicking that can only mean one thing: your neighbor is cutting his nails. At work. Why not at home, in the bathroom, after a shower? Why not in the office bathroom? Why not outside? Think, McFly, think.
3. Don't get happy foot. I don't know what else to call this. I was typing the other day and suddenly felt the floor jiggle. Then it continued, as if the floor was dancing to a beat. Was it alive? No. Earthquake? Too subtle. Was a janitor moving heavy office equipment nearby? That's not a job for janitors. I stood up to investigate and around the corner was the answer: my neighbor's foot was bouncing around like a bunny on speed. The strange thing is the person doing this sort of thing rarely notices it themselves - it's a subconscious thing. My neighbor was working away, oblivious. Another former colleague of mine did this sort of thing too - he was very tall with big feet and would do a fairly thunderous tapping that could be felt 30 feet across the floor. I once mentioned it to him and he had no idea he was doing it. Most offices have raised floors, folks. They flex and bounce, and when you're doing this sort of thing it's probably being felt by others. Try to be conscious of it.
4. Don't throw your half-eaten food into your personal trash can. It may have tasted delectable, but it's not going to smell delectable in a couple hours. A junior staffer once left his half-eaten fish in his trash can and the rest of us had to endure the stench the entire following day. But even the mildest of foods will start to smell. Use the trash can in your cafeteria on in the small kitchen on your floor. That's what they're for: food waste.
5. Don't sleep at your chair. A guy I used to sit next to did this all the time. Granted we were in banking so I didn't blame him, but when the snoring started it really became distracting. How about grabbing an empty office? Or a closet? (A woman I know would actually use her sleeping bag and nap on the floor of an office closet.) Instead, if you sleep at your chair, co-workers' camera phones will come out and the snickering will start, and there you will sleep, gaping mouth and all.
6. Don't put everyone you talk to on speaker phone. This one applies mainly to those of you who don't have your own private office. Use the speaker rarely. If you want to be hands-free, use a headset. You may think the conversation you're having is quite interesting, but nobody else does. Your neighbor probably can't hear the conversation they are having and your other neighbor probably can't concentrate and wants to throw their heavy-duty Swingline stapler at you. It's just not courteous behavior.
7. Be discriminating in discussing your personal life. Granted, when the significant other comes calling you probably have to take it, but why continually invite those you work with into your personal life? I guess I can think of three reasons: you want to be the center of office gossip, you find it fun to distract those around you trying to do work, or you don't want others to take you seriously. I once sat next to someone who did this day in and day out, whether with co-workers or on the phone, and I can tell you pretty much anything you want to know about her. She's divorced, she lives in Marina, she fancies herself a skilled drinker, her boyfriend is named Pete, she has a credit card company who continually makes mistakes on her statements, she has high cholesterol, she takes the bus to work - and that's just a start. Now, I sat within earshot of at least 15 other people and couldn't tell you even a fraction of that about each of them. They seemed to get along just fine keeping their personal lives separate from work.
You may have read this and it sounds pet-peevish (it is), but so what? Nobody ever said your peers - or your bosses - aren't allowed to be sensitive or annoyed about things like the above. People you work with may not say it, but they harbor all kinds of prejudices and pass all kinds of judgments that you don't know about. If you just don't care where you wind up, then don't worry about this stuff. But if you do care, these things will just help you behave more professionally and improve your chances of advancing.