I thought of a few, all from the same office.
1) This was back when "Twilight" was huge, before the first movie came out. Many of the girls, and some of the women too, were really into the series, swearing it was "SOOO good" and saying the author had been compared to J.K. Rowling.

I'll admit, I read it from "Twilight" to "Breaking Dawn" to see what the hype was about and because well, I got sucked in too.

Another girl got into the hype later than the rest of us, and told a few of us on a Thursday that once her pay showed up in her account (Payday was Friday but direct deposit usually showed up around 5 of the day before) she'd buy all the books and take the whole next day to read the books. She called in the next day saying her son was sick, then on the following Monday confessed to some of us that he wasn't, she just wanted to take the whole day to read the whole series. She didn't get fired for this, but down the road she did.
2) This I heard from a friend who still works there, as it happened after I left. This girl had Special Snowflake written all over her. SS told everyone she needed to quit because she was going back to school and wouldn't have time to work and study/attend classes. She put in her resignation and the doctors gave her a $100 gift card towards buying school supplies. Nice, right?
They found out later she wasn't going back to school at all, she'd gotten a new job. The docs were understandably PISSED. I would be too, but I don't know what they did about it other than they'll probably be more careful about doing something like that again without checking to be sure it's true.
3) This happened within a few months of my starting the job, summer of 2007. The friend with whom I'm still in touch, A, was engaged with her wedding coming up shortly. She worked in the front office, but had been looking to become a medical assistant. One of the doctors was soon to lose his MA because she had been offered another job so right before she left for her wedding, she was told that upon her return she would start the training to be Dr. R's MA. A was THRILLED! All this and getting married, too? We were all happy for her too, as she's a really sweet girl and we felt she deserved it.
Well, most of us did. Another girl, who was sort of the unofficial front office manager at the time, had been there longer than A and thought she deserved the position more so than A did. But thing was that B was not as qualified as A was. Well B knew that if she quit, there wouldn't be enough people at the front desk so A would have to stay up front instead of training to be an MA. So B quit, giving only a week notice instead of the customary and required 2 weeks. The head doctor had her sign a form saying she understood that she would not get a favorable reference from them if she put them down as one.
But the best part? Her plan didn't work. The office just hired another 2 people for the front office to take both A & B's places, and A still was able to train as an MA. So B pretty much screwed herself out of a possibly good reference for no reason at all.
Last one!
4) BG/ One of the benefits offered for FT employees was of course insurance, and the company would put $1500 in a medical expense account for you if you signed up for the insurance. You only had to be working there for about 3 months to qualify to sign up. /BG
This girl was with the father of the child, but they weren't engaged until shortly before the baby was due. Come the 3 months, she signed up for the insurance, as since she wasn't married to the father, his insurance wouldn't cover her and she of course needed insurance before the child was born. Shortly before her due date, Dr. F called her into his office to be sure she would return once maternity leave was over. "Oh sure, Dr. F!! I love working with you, of course I'll come back!"
They found out later she'd lied through her teeth. She'd had absolutely NO intention of coming back after her maternity leave, and she'd only been working so she could get the $1,500 the practice put towards the employee's medical expenses to cover for the baby then she was going to quit. Dr. F was both furious and disappointed. He and this girl got along really well, better than he had with any of his other assistants, and she'd lied right to his face.