"My favorite job while I was in college was working at a local nutrition store. It had great hours, solid commissions, and a truly receptive client base. My boss, though, was the worst. She couldn't think more than a few steps in advance, often coming in on her off days to complete tasks she couldn't finish and to micromanage how we sold products.

"One day, she came in when we had about 15 people in the store. (It was a tiny store.) Before she showed up, I was the only one helping everyone. Instead of helping, or even enlightening our customers that she was off the clock and that couldn't ring anyone up, she decided to ignore everyone.

"What could have been a top sales day for the region instead turned into an average day. After confronting my manager about this, because I was truly upset, she proceeded to tell me that I was wrong, and that customers knew she was off the clock.

"She even went as far as to say, 'Oh I know those guys, they never buy! They always browse!' I lost it.

"I ripped out a chunk of a marketing poster we had hanging up behind the counter, proceeded to write a letter of resignation on the back, and walked out of the store.

"It was absolutely unprofessional, and I wish I went about it in a better way, but as a very passionate and emotional 20-year-old, that wasn't going to happen." — Jay, Glenview