"It's called a lunch hour for a reason," Wheatman says. As such, she asserts that you shouldn't be planning things during your midday break that are going take longer than the time allowed. Or, at the very least, refrain from doing this on a regular basis. "Don't make a habit of it," Hughes agrees. "And when you do [take a long lunch], make sure that it is because you are trying to reel in that amazing new client, and not because you had to get a pedicure with a friend."
According to Carney, so long as you're not leaving your co-workers in a lurch, "an unplanned day from time to time can be a good thing." "Your employer wants to you be able to focus and be effective at work," Hughes agrees. "If you're too stressed or have things at home that are distracting you from your work, don't be afraid to take a well-deserved mental health day." Calling out sick on a Friday will raise some eyebrows.
Verdict: Fact, especially in the summer.
"Even if you are the perfect employee, people will think you are faking it," Hurwitz says. Charles Purdy, a career expert with Monster.com, agrees and says those faced with calling out on a Friday should make sure you have a legitimate reason to do so. "If you simply want to jump-start the weekend, take a vacation day," he says. Slacking off after giving notice is to be expected.
It may be hard to give it your all when you're halfway out the door, but experts agree it's in your best interest to do so. "Slacking on two weeks' notice is never a good idea," Egan says. "People definitely remember how you leave, and the last impression you make at work can be the one your boss and your co-workers remember." "People change jobs very rapidly," Purdy says, adding that even though you've already secured a new position, you still may need your soon-to-be former employer as references in the future. Partaking in office gossip is harmless.
It may seem harmless enough, but all experts agree you should refrain from blabbering around the water cooler. This is because gossiping isn't just a violation of office etiquette, it's also a potential career killer. "The 'rumor mill' in companies can be quite seductive, but it's important to remember that it is often based on false premises, gossip and personal agendas," Hughes says. "Validators of the rumor mill are not frequently selected for promotions." >To submit a news tip, email: email@example.com. Follow TheStreet.com on Twitter and become a fan on Facebook.