Rachel Zupek, CareerBuilder.com

It's a Friday afternoon in the office. You're in the TGIF mood, looking forward to the weekend ahead. Fast-forward to Sunday. You're feeling a little (or a lot) depressed, dreading the thought of going back to work the next day. You've thought about calling in sick (even though you're not), you've bent the ears of friends and family about workplace issues, and you've re-lived hurtful comments or snubs from bosses and co-workers. What gives?

CareerBuilder.com

We all do it: release an extra snicker at a joke, give a casual compliment or have the inclination to agree. We all like to hand the boss a little extra attention, secretly hoping it makes us look better in her eyes. But there are those who do it well and come off as polished and respectful, and those who are just hopelessly obvious yes-men.

Here are some tips on being a stealthy suck-up:

CareerBuilder.com writer

Loud conversation, miniature basketball games, hollering across the office and a brazen lack of courtesy for other employees are eminent in today's workplace, replacing what used to be a quiet, work-compatible atmosphere. With 58 percent of American offices housing cube farms for employees, good manners regarding workers' home away from home is a must.

Check out the following questions from concerned employees about cube manners and how our experts weigh in.

Rachel Zupek, CareerBuilder.com writer

Friday is, hands down, the best day of the workweek. Not only is it the last working day, it's usually in conjunction with pay day, summer hours and, if you're lucky, a casual dress code.

But how casual is too casual?

Anthony Balderrama, CareerBuilder.com writer

Supposedly it takes 21 days to form a habit.

I'm convinced, however, workplace habits take a little longer to break. The little annoyances -- like the guy who picks his teeth with your letter opener -- aren't what I'm talking about. I'm thinking of the bigger offenses that require a complete change of your mindset. They're annoying to everyone else and they're actually damaging your career.

Here are eight work habits you need to break now.