There are countless lessons you can only learn on the job. Sure you will make some unfortunate mistakes along the way, but you will learn from them over time. However, there are certain things you should know never to do - whether you're the CEO or the intern - you'll want to avoid these office blunders.

1. Never Microwave Fish: We've experienced this on our office floor, and it's not pretty. This is an easy way to lose friends and eat lunch alone forever. Burning your popcorn in the microwave doesn't bode well either.

2. Never Scream Over the Phone: You can make a personal call here and there, but getting into a full-blown fight with your ex-boyfriend in front of your co-workers? They want to tune into bad reality TV in the evening, not at the office.

3. Never Snoop through Your Co-workers Computer/Desk: It's tempting when you're sitting at someone's computer to glance down at their incoming messages, but it's an absolute no-no to go through your co-worker's e-mails.

4. Never Talk About How Much Money You Make: Did you just find out you're up for a big raise? Keep it to yourself. You don't want your co-workers a.) walking up to your manager demanding their own salary increase or b.) secretly hating you (they will) from that point on.

5. Never Call Out Sick to Hit up Bloomingdales: Yes, sometimes we could all use some retail therapy to de-stress outside the office. But skipping work to hit up a sale, and then showing up looking healthy and trendy in a new outfit? RISKY!

6. Never Over Share with Co-workers: Find a couple of friends you can trust in the office, and even with them be careful what you disclose. Your overly quiet cubemate doesn't need to hear all the details from last weekend's bachelorette party, or the progress of fungal infection cream you're using on your toe. T.M.I.!

7. Never Take the Role of Office Gossip: You may feel like the Queen Bee at work, but you'll be known as the one who spreads the juicy, and sometimes fictional, stories. People will stop trusting you with any information, personal and professional. It's always better to be known in the office as someone trustworthy.

What are some things you would never, ever do at work? Write in and we'll add them to our list.

Click here to find out what you should be doing at work.